diff --git a/web-admin/src/utils/pl-vehicle-cert-zip.test.ts b/web-admin/src/utils/pl-vehicle-cert-zip.test.ts
new file mode 100644
index 000000000..d879b9bd1
--- /dev/null
+++ b/web-admin/src/utils/pl-vehicle-cert-zip.test.ts
@@ -0,0 +1,121 @@
+import assert from 'node:assert/strict'
+import { describe, it } from 'node:test'
+import {
+  collectVehicleCertZipEntries,
+  buildVehicleCertZipFilename,
+  uniqueZipPath,
+  sanitizeZipPathSegment
+} from './pl-vehicle-cert-zip'
+
+describe('sanitizeZipPathSegment', () => {
+  it('replaces unsafe path chars', () => {
+    assert.equal(sanitizeZipPathSegment('皖A/D12\\345'), '皖A_D12_345')
+    assert.equal(sanitizeZipPathSegment('  皖A  '), '皖A')
+  })
+})
+
+describe('collectVehicleCertZipEntries', () => {
+  it('skips vehicles and certs without urls; prefixes 主·/挂· when trailer certs exist', () => {
+    const entries = collectVehicleCertZipEntries([
+      {
+        id: 'v1',
+        licensePlate: '皖AD12345',
+        trailerNo: '挂A8888',
+        certList: [
+          {
+            id: 'c1',
+            ownerType: 'vehicle',
+            ownerId: 'v1',
+            status: '1',
+            certName: '行驶证',
+            vehiclePart: 'head',
+            attachmentUrls: 'https://cdn.example/a.jpg'
+          },
+          {
+            id: 'c2',
+            ownerType: 'vehicle',
+            ownerId: 'v1',
+            status: '1',
+            certName: '道路运输证',
+            vehiclePart: 'head',
+            attachmentUrls: ''
+          },
+          {
+            id: 'c3',
+            ownerType: 'vehicle',
+            ownerId: 'v1',
+            status: '1',
+            certName: '行驶证',
+            vehiclePart: 'trailer',
+            attachmentUrls: 'https://cdn.example/b.pdf'
+          }
+        ]
+      },
+      {
+        id: 'v2',
+        licensePlate: '皖BF67890',
+        certList: []
+      }
+    ])
+
+    assert.equal(entries.length, 1)
+    assert.equal(entries[0].vehicleId, 'v1')
+    assert.equal(entries[0].plateFolder, '皖AD12345挂A8888')
+    assert.equal(entries[0].files.length, 2)
+    assert.equal(entries[0].files[0].baseName, '主·行驶证')
+    assert.equal(entries[0].files[0].ext, 'jpg')
+    assert.equal(entries[0].files[1].baseName, '挂·行驶证')
+    assert.equal(entries[0].files[1].ext, 'pdf')
+  })
+
+  it('omits 主·/挂· prefix when no trailer certs on that vehicle', () => {
+    const entries = collectVehicleCertZipEntries([
+      {
+        id: 'v1',
+        licensePlate: '皖BF67890',
+        certList: [
+          {
+            id: 'c1',
+            ownerType: 'vehicle',
+            ownerId: 'v1',
+            status: '1',
+            certName: '行驶证',
+            vehiclePart: 'head',
+            attachmentUrls: 'https://cdn.example/a.jpg,https://cdn.example/a2.png'
+          }
+        ]
+      }
+    ])
+    assert.equal(entries[0].files.length, 2)
+    assert.equal(entries[0].files[0].baseName, '行驶证')
+    assert.equal(entries[0].files[1].baseName, '行驶证')
+  })
+})
+
+describe('buildVehicleCertZipFilename', () => {
+  it('names single-vehicle zip with plate', () => {
+    assert.equal(
+      buildVehicleCertZipFilename([{ plateFolder: '皖AD12345挂A8888' }], '20260908'),
+      '车辆证书_皖AD12345挂A8888.zip'
+    )
+  })
+
+  it('names multi-vehicle zip with count and date', () => {
+    assert.equal(
+      buildVehicleCertZipFilename(
+        [{ plateFolder: 'A' }, { plateFolder: 'B' }],
+        '20260908'
+      ),
+      '车辆证书批量_2辆_20260908.zip'
+    )
+  })
+})
+
+describe('uniqueZipPath', () => {
+  it('appends _2 _3 on collisions', () => {
+    const used = new Set<string>()
+    assert.equal(uniqueZipPath(used, '行驶证.jpg'), '行驶证.jpg')
+    assert.equal(uniqueZipPath(used, '行驶证.jpg'), '行驶证_2.jpg')
+    assert.equal(uniqueZipPath(used, '行驶证.jpg'), '行驶证_3.jpg')
+  })
+})
diff --git a/web-admin/src/utils/pl-vehicle-cert-zip.ts b/web-admin/src/utils/pl-vehicle-cert-zip.ts
new file mode 100644
index 000000000..4e517af49
--- /dev/null
+++ b/web-admin/src/utils/pl-vehicle-cert-zip.ts
@@ -0,0 +1,147 @@
+import type { CertRead } from '@/api/pl'
+import { formatPlVehiclePlateDisplay } from '@/utils/pl-display'
+import {
+  PL_VEHICLE_CERT_PART_TRAILER,
+  normalizeVehicleCertPart
+} from '@/utils/pl-vehicle-cert'
+
+export type VehicleCertZipSource = {
+  id: string
+  licensePlate?: string | null
+  trailerNo?: string | null
+  certList?: CertRead[] | null
+}
+
+export type VehicleCertZipFile = {
+  fileUrl: string
+  baseName: string
+  ext: string
+}
+
+export type VehicleCertZipEntry = {
+  vehicleId: string
+  plateFolder: string
+  files: VehicleCertZipFile[]
+}
+
+export function sanitizeZipPathSegment(raw: string): string {
+  return String(raw || '')
+    .trim()
+    .replace(/[\\/:*?"<>|]+/g, '_')
+    .replace(/\s+/g, ' ')
+    .trim() || '未命名'
+}
+
+/** Mirrors `normalizeAttachmentUrls` in download-attachment.ts (inlined for node:test). */
+function normalizeAttachmentUrls(raw?: string | null): string {
+  if (!raw) return ''
+  const trimmed = String(raw).trim()
+  if (!trimmed) return ''
+  if (trimmed.startsWith('[')) {
+    try {
+      const parsed = JSON.parse(trimmed)
+      if (Array.isArray(parsed)) {
+        return parsed.map((url) => String(url).trim()).filter(Boolean).join(',')
+      }
+    } catch {
+      /* ignore */
+    }
+  }
+  return trimmed
+}
+
+function parseUrls(raw?: string | null): string[] {
+  const normalized = normalizeAttachmentUrls(raw)
+  if (!normalized) return []
+  return normalized
+    .split(',')
+    .map((item) => item.trim())
+    .filter(Boolean)
+}
+
+function getFileExt(url: string): string {
+  const name =
+    String(url || '')
+      .split('?')[0]
+      .split('/')
+      .pop() || ''
+  const lastDot = name.lastIndexOf('.')
+  if (lastDot === -1) return ''
+  return name.slice(lastDot + 1).toLowerCase()
+}
+
+function partPrefix(cert: CertRead, enablePart: boolean): string {
+  if (!enablePart) return ''
+  return normalizeVehicleCertPart(cert.vehiclePart) === PL_VEHICLE_CERT_PART_TRAILER
+    ? '挂·'
+    : '主·'
+}
+
+export function collectVehicleCertZipEntries(
+  vehicles: VehicleCertZipSource[]
+): VehicleCertZipEntry[] {
+  const result: VehicleCertZipEntry[] = []
+
+  for (const vehicle of vehicles) {
+    const certs = vehicle.certList || []
+    const enablePart = certs.some(
+      (cert) => normalizeVehicleCertPart(cert.vehiclePart) === PL_VEHICLE_CERT_PART_TRAILER
+    )
+    const files: VehicleCertZipFile[] = []
+
+    certs.forEach((cert) => {
+      const certName = String(cert.certName || '').trim() || '证书'
+      const prefix = partPrefix(cert, enablePart)
+      const baseName = `${prefix}${certName}`
+      parseUrls(cert.attachmentUrls).forEach((fileUrl) => {
+        files.push({
+          fileUrl,
+          baseName,
+          ext: getFileExt(fileUrl)
+        })
+      })
+    })
+
+    if (!files.length) continue
+
+    const plateRaw = formatPlVehiclePlateDisplay(vehicle.licensePlate, vehicle.trailerNo)
+    result.push({
+      vehicleId: vehicle.id,
+      plateFolder: sanitizeZipPathSegment(plateRaw === '—' ? vehicle.id : plateRaw),
+      files
+    })
+  }
+
+  return result
+}
+
+export function buildVehicleCertZipFilename(
+  entries: Array<{ plateFolder: string }>,
+  yyyymmdd: string
+): string {
+  if (entries.length === 1) {
+    return `车辆证书_${entries[0].plateFolder}.zip`
+  }
+  return `车辆证书批量_${entries.length}辆_${yyyymmdd}.zip`
+}
+
+export function uniqueZipPath(used: Set<string>, relativePath: string): string {
+  if (!used.has(relativePath)) {
+    used.add(relativePath)
+    return relativePath
+  }
+  const lastSlash = relativePath.lastIndexOf('/')
+  const dir = lastSlash >= 0 ? relativePath.slice(0, lastSlash + 1) : ''
+  const name = lastSlash >= 0 ? relativePath.slice(lastSlash + 1) : relativePath
+  const lastDot = name.lastIndexOf('.')
+  const stem = lastDot > 0 ? name.slice(0, lastDot) : name
+  const ext = lastDot > 0 ? name.slice(lastDot) : ''
+  let i = 2
+  let candidate = `${dir}${stem}_${i}${ext}`
+  while (used.has(candidate)) {
+    i += 1
+    candidate = `${dir}${stem}_${i}${ext}`
+  }
+  used.add(candidate)
+  return candidate
+}