diff --git a/src/business/rankings/rankings.controller.ts b/src/business/rankings/rankings.controller.ts
index dffc518..146d825 100644
--- a/src/business/rankings/rankings.controller.ts
+++ b/src/business/rankings/rankings.controller.ts
@@ -1,5 +1,6 @@
-import { Controller, Get, Query } from '@nestjs/common';
+import { Controller, Get, Header, Param, Query, Res } from '@nestjs/common';
 import { ApiOperation, ApiQuery, ApiTags } from '@nestjs/swagger';
+import { Response } from 'express';
 import { RankingsService } from './rankings.service';
 import { RankingCategoryId } from './rankings.types';
 
@@ -8,6 +9,17 @@ import { RankingCategoryId } from './rankings.types';
 export class RankingsController {
   constructor(private readonly rankingsService: RankingsService) {}
 
+  @Get('datawhale-honor/avatar/:memberId')
+  @Header('Cache-Control', 'public, max-age=86400, stale-while-revalidate=604800')
+  @ApiOperation({ summary: '代理 Datawhale 荣誉榜成员头像' })
+  async getDatawhaleMemberAvatar(
+    @Param('memberId') memberId: string,
+    @Res() res: Response,
+  ): Promise<void> {
+    const avatar = await this.rankingsService.getMemberAvatar(memberId);
+    res.type(avatar.contentType).send(avatar.body);
+  }
+
   @Get('datawhale-honor')
   @ApiOperation({
     summary: '获取Datawhale荣誉榜',
diff --git a/src/business/rankings/rankings.service.ts b/src/business/rankings/rankings.service.ts
index 63d35eb..14e1512 100644
--- a/src/business/rankings/rankings.service.ts
+++ b/src/business/rankings/rankings.service.ts
@@ -1,4 +1,4 @@
-import { BadGatewayException, Injectable, Logger, OnModuleInit } from '@nestjs/common';
+import { BadGatewayException, Injectable, Logger, NotFoundException, OnModuleInit } from '@nestjs/common';
 import { Cron } from '@nestjs/schedule';
 import axios from 'axios';
 import {
@@ -17,6 +17,12 @@ const DATAWHALE_WEEKLY_COMMITS_URL = 'https://mv.datawhale.cc/data/commits_weekl
 const DATAWHALE_ASSET_BASE_URL = 'https://mv.datawhale.cc/';
 const DEFAULT_CATEGORY: RankingCategoryId = 'weekly_commits';
 const DEFAULT_LIMIT = 10;
+const MAX_AVATAR_BYTES = 2 * 1024 * 1024;
+
+export interface RankingAvatarPayload {
+  body: Buffer;
+  contentType: string;
+}
 
 const CATEGORIES: RankingCategory[] = [
   {
@@ -115,6 +121,40 @@ export class RankingsService implements OnModuleInit {
     return this.getCachedPayload(DEFAULT_CATEGORY, DEFAULT_LIMIT);
   }
 
+  async getMemberAvatar(memberId: string): Promise<RankingAvatarPayload> {
+    const normalizedId = this.cleanString(memberId);
+    const member = this.members.find(item => this.cleanString(item.id) === normalizedId);
+    if (!member) {
+      throw new NotFoundException('榜单成员不存在');
+    }
+    const avatarUrl = this.sourceAvatarUrl(member);
+    if (!avatarUrl) {
+      throw new NotFoundException('榜单成员没有头像');
+    }
+    try {
+      const response = await axios.get<ArrayBuffer>(avatarUrl, {
+        responseType: 'arraybuffer',
+        timeout: 10000,
+        maxContentLength: MAX_AVATAR_BYTES,
+        maxBodyLength: MAX_AVATAR_BYTES,
+      });
+      const body = Buffer.from(response.data);
+      if (body.length === 0 || body.length > MAX_AVATAR_BYTES) {
+        throw new BadGatewayException('头像源返回的文件大小异常');
+      }
+      const contentType = this.detectImageContentType(body);
+      if (!contentType) {
+        throw new BadGatewayException('头像源返回了不支持的文件类型');
+      }
+      return { body, contentType };
+    } catch (error) {
+      if (error instanceof BadGatewayException) {
+        throw error;
+      }
+      throw new BadGatewayException(`头像源请求失败：${this.errorMessage(error)}`);
+    }
+  }
+
   private getCachedPayload(
     category: RankingCategoryId,
     limit: number,
@@ -366,6 +406,13 @@ export class RankingsService implements OnModuleInit {
   }
 
   private avatarUrl(member: DatawhaleMemberRow): string {
+    const id = this.cleanString(member.id);
+    return id && this.sourceAvatarUrl(member)
+      ? `/api/rankings/datawhale-honor/avatar/${encodeURIComponent(id)}`
+      : '';
+  }
+
+  private sourceAvatarUrl(member: DatawhaleMemberRow): string {
     const avatar = this.cleanString(member.avatar);
     if (!avatar) {
       return '';
@@ -423,6 +470,19 @@ export class RankingsService implements OnModuleInit {
     return Number.isFinite(parsed) ? parsed : 0;
   }
 
+  private detectImageContentType(body: Buffer): string {
+    if (body.length >= 8 && body.subarray(0, 8).equals(Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]))) {
+      return 'image/png';
+    }
+    if (body.length >= 3 && body[0] === 0xff && body[1] === 0xd8 && body[2] === 0xff) {
+      return 'image/jpeg';
+    }
+    if (body.length >= 12 && body.toString('ascii', 0, 4) === 'RIFF' && body.toString('ascii', 8, 12) === 'WEBP') {
+      return 'image/webp';
+    }
+    return '';
+  }
+
   private cleanString(value: unknown): string {
     return String(value ?? '').trim();
   }