diff --git a/src/main/java/com/knowledge/base/infrastructure/cache/RedisFileCacheService.java b/src/main/java/com/knowledge/base/infrastructure/cache/RedisFileCacheService.java
index 4dc6a90..683787b 100644
--- a/src/main/java/com/knowledge/base/infrastructure/cache/RedisFileCacheService.java
+++ b/src/main/java/com/knowledge/base/infrastructure/cache/RedisFileCacheService.java
@@ -6,7 +6,9 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.data.redis.core.StringRedisTemplate;
 import org.springframework.stereotype.Service;
 
+import java.util.HashSet;
 import java.util.Optional;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -23,8 +25,10 @@ public class RedisFileCacheService implements FileCacheService {
 
     private final StringRedisTemplate redisTemplate;
 
+    private static final String FILE_CACHE_PREFIX = "kb-file";
+
     private String key(String prefix, String key) {
-        return String.format("kb:file:%s:%s", prefix, key);
+        return String.format(FILE_CACHE_PREFIX + ":%s:%s", prefix, key);
     }
 
     @Override
@@ -66,7 +70,32 @@ public class RedisFileCacheService implements FileCacheService {
 
     @Override
     public void clearAll() {
-        // 不清理 Redis 所有数据，仅为接口保留占位符
-        log.warn("清空 Redis 文件缓存未实现，请手动清理前缀为 kb:file 的数据。");
+        log.warn("正在清空 Redis 文件缓存，前缀: {}", FILE_CACHE_PREFIX);
+        Set<String> keysToDelete = scanKeys(FILE_CACHE_PREFIX + "*");
+        if (keysToDelete.isEmpty()) {
+            log.info("没有需要清理的文件缓存 Key。");
+            return;
+        }
+        redisTemplate.delete(keysToDelete);
+        log.info("已清空 Redis 文件缓存 Key 数量: {}", keysToDelete.size());
     }
+
+    /**
+     * 用 scan 命令遍历所有带 prefix 的 key（推荐，不会阻塞大 Redis）
+     */
+    private Set<String> scanKeys(String pattern) {
+        Set<String> keySet = new HashSet<>();
+        // 采用 scan，分批遍历，安全高效
+        redisTemplate.execute((connection) -> {
+            try (var cursor = connection.scan(org.springframework.data.redis.core.ScanOptions.scanOptions()
+                    .match(pattern)
+                    .count(1000)
+                    .build())) {
+                cursor.forEachRemaining(item -> keySet.add(new String(item)));
+            }
+            return null;
+        }, false, true);
+        return keySet;
+    }
+
 }