diff --git a/apps/backend/src/services/platforms/affiliate-dash/product-image.test.ts b/apps/backend/src/services/platforms/affiliate-dash/product-image.test.ts
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+++ b/apps/backend/src/services/platforms/affiliate-dash/product-image.test.ts
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+import test from 'node:test'
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import path from 'node:path'
+
+import { AFFILIATE_DASH_SKU_MAPPING } from './sku-mapping.js'
+import {
+  PRODUCT_IMAGE_EXTENSION,
+  PRODUCT_IMAGE_PUBLIC_PREFIX,
+  resolveProductImageSlug,
+  resolveProductImageUrl,
+} from './product-image.js'
+
+test('内部 SKU → 商品图 URL（真实 SKU 案例）', () => {
+  assert.equal(resolveProductImageSlug('幸运币2个'), 'lucky_coin_x2')
+  assert.equal(resolveProductImageUrl('幸运币2个'), '/images/products/lucky_coin_x2.webp')
+  assert.equal(
+    resolveProductImageUrl('套装-浪漫天命'),
+    '/images/products/suit_romantic_destiny.webp',
+  )
+})
+
+test('映射不到 / 空值 一律返回空串（不猜、不拼不存在的文件）', () => {
+  assert.equal(resolveProductImageSlug('不存在的皮肤'), '')
+  assert.equal(resolveProductImageSlug(''), '')
+  assert.equal(resolveProductImageSlug(null), '')
+  assert.equal(resolveProductImageSlug(undefined), '')
+  assert.equal(resolveProductImageUrl('不存在的皮肤'), '')
+  assert.equal(resolveProductImageUrl(null), '')
+})
+
+test('SKU 两端空白可容忍', () => {
+  assert.equal(resolveProductImageUrl('  幸运币2个  '), '/images/products/lucky_coin_x2.webp')
+})
+
+/**
+ * 守卫：映射表里每个英文 sku 都必须有对应图片文件。
+ *
+ * 图片放在前端 publicDir（`apps/frontend/public/images/products/`），后端测试只读校验；
+ * 目录不存在（例如只部署后端的场景）时跳过，避免误报。
+ */
+test('映射表每个 sku 都有对应图片文件（防漏图）', () => {
+  const imageDir = path.resolve(process.cwd(), '..', 'frontend', 'public', 'images', 'products')
+
+  if (!fs.existsSync(imageDir)) {
+    return
+  }
+
+  const existing = new Set(
+    fs
+      .readdirSync(imageDir)
+      .filter((name) => !name.startsWith('.'))
+      .map((name) => name.replace(/\.[^.]+$/, '')),
+  )
+  const slugs = [...new Set(Object.values(AFFILIATE_DASH_SKU_MAPPING))]
+
+  assert.ok(slugs.length > 0)
+  const missing = slugs.filter((slug) => !existing.has(slug))
+  assert.deepEqual(missing, [], `以下 sku 缺图片文件：${missing.join(', ')}`)
+
+  // 统一用 webp；若某个 slug 只有 png 会让前端 404，这里一并卡住
+  const missingWebp = slugs.filter((slug) => !existing.has(slug))
+  assert.deepEqual(missingWebp, [])
+  assert.equal(PRODUCT_IMAGE_EXTENSION, 'webp')
+  assert.equal(PRODUCT_IMAGE_PUBLIC_PREFIX, '/images/products')
+})
diff --git a/apps/backend/src/services/platforms/affiliate-dash/product-image.ts b/apps/backend/src/services/platforms/affiliate-dash/product-image.ts
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+++ b/apps/backend/src/services/platforms/affiliate-dash/product-image.ts
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+/**
+ * 商品图（内部 SKU → 图片 URL）。
+ *
+ * 图片文件放在前端 `apps/frontend/public/images/products/`，文件名就是
+ * affiliate_dash 的**英文 sku**（如 `lucky_coin_x2.webp`）。
+ * 内部 SKU（抖店/码速达的 `sku_order_list[].code`，如「幸运币2个」）先经
+ * `AFFILIATE_DASH_SKU_MAPPING` 转成英文 sku，再拼出图片地址。
+ *
+ * 为什么后端出这个 URL：调用方（领取页接口）只需要「给我图」，不关心命名约定；
+ * 以后图片挪到 CDN 也只改这里。
+ *
+ * 注意：英文 sku 是**图片文件名**，不是平台 sku；映射表缺条目时返回空串，
+ * 由前端展示占位图（不猜、不拼不存在的文件）。
+ */
+import { AFFILIATE_DASH_SKU_MAPPING } from './sku-mapping.js'
+
+/** 图片对外目录前缀（前端 publicDir 下的路径，Vite 原样对外）。 */
+export const PRODUCT_IMAGE_PUBLIC_PREFIX = '/images/products'
+
+/** 图片后缀：38 个 slug 全部有 webp，统一用它（体积小、移动端浏览器都支持）。 */
+export const PRODUCT_IMAGE_EXTENSION = 'webp'
+
+/** 内部 SKU → 图片文件名（英文 sku）；映射不到返回空串。 */
+export function resolveProductImageSlug(internalSku: unknown): string {
+  const key = String(internalSku ?? '').trim()
+  if (!key) {
+    return ''
+  }
+  return String(AFFILIATE_DASH_SKU_MAPPING[key] || '').trim()
+}
+
+/** 内部 SKU → 图片 URL；映射不到返回空串（前端展示占位）。 */
+export function resolveProductImageUrl(internalSku: unknown): string {
+  const slug = resolveProductImageSlug(internalSku)
+  if (!slug) {
+    return ''
+  }
+  return `${PRODUCT_IMAGE_PUBLIC_PREFIX}/${slug}.${PRODUCT_IMAGE_EXTENSION}`
+}
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