diff --git a/app/Console/Commands/PurgeOldMessages.php b/app/Console/Commands/PurgeOldMessages.php
new file mode 100644
index 0000000..525f535
--- /dev/null
+++ b/app/Console/Commands/PurgeOldMessages.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * 文件功能：定期清理聊天记录 Artisan 命令
+ *
+ * 每天自动清理超过指定天数的聊天记录，保持数据库体积可控。
+ * 保留天数可通过 sysparam 表的 message_retention_days 配置，默认 30 天。
+ *
+ * @author   ChatRoom Laravel
+ *
+ * @version  1.0.0
+ */
+
+namespace App\Console\Commands;
+
+use App\Models\Message;
+use App\Models\Sysparam;
+use Carbon\Carbon;
+use Illuminate\Console\Command;
+
+class PurgeOldMessages extends Command
+{
+    /**
+     * 命令签名
+     *
+     * @var string
+     */
+    protected $signature = 'messages:purge
+                            {--days= : 覆盖默认保留天数}
+                            {--dry-run : 仅预览不实际删除}';
+
+    /**
+     * 命令描述
+     *
+     * @var string
+     */
+    protected $description = '清理超过指定天数的聊天记录（保留天数由 sysparam message_retention_days 配置，默认 30 天）';
+
+    /**
+     * 执行命令
+     *
+     * 按批次删除旧消息，避免长时间锁表。
+     */
+    public function handle(): int
+    {
+        // 保留天数：命令行参数 > sysparam 配置 > 默认 30 天
+        $days = (int) ($this->option('days')
+            ?: Sysparam::getValue('message_retention_days', '30'));
+
+        $cutoff = Carbon::now()->subDays($days);
+        $isDryRun = $this->option('dry-run');
+
+        // 统计待清理数量
+        $totalCount = Message::where('sent_at', '<', $cutoff)->count();
+
+        if ($totalCount === 0) {
+            $this->info("✅ 没有超过 {$days} 天的聊天记录需要清理。");
+
+            return self::SUCCESS;
+        }
+
+        if ($isDryRun) {
+            $this->warn("🔍 [预览模式] 将删除 {$totalCount} 条超过 {$days} 天的聊天记录（截止 {$cutoff->toDateTimeString()}）");
+
+            return self::SUCCESS;
+        }
+
+        $this->info("🧹 开始清理超过 {$days} 天的聊天记录（截止 {$cutoff->toDateTimeString()}）...");
+        $this->info("   待清理数量：{$totalCount} 条");
+
+        // 分批删除，每批 1000 条，避免长时间锁表
+        $deleted = 0;
+        $batchSize = 1000;
+
+        do {
+            $batch = Message::where('sent_at', '<', $cutoff)
+                ->limit($batchSize)
+                ->delete();
+
+            $deleted += $batch;
+
+            if ($batch > 0) {
+                $this->line("   已删除 {$deleted}/{$totalCount} 条...");
+            }
+        } while ($batch === $batchSize);
+
+        $this->info("✅ 清理完成！共删除 {$deleted} 条聊天记录。");
+
+        return self::SUCCESS;
+    }
+}
diff --git a/routes/console.php b/routes/console.php
index 3c9adf1..16042f6 100644
--- a/routes/console.php
+++ b/routes/console.php
@@ -2,7 +2,11 @@
 
 use Illuminate\Foundation\Inspiring;
 use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\Schedule;
 
 Artisan::command('inspire', function () {
     $this->comment(Inspiring::quote());
 })->purpose('Display an inspiring quote');
+
+// 每天凌晨 3 点清理超过 30 天的聊天记录
+Schedule::command('messages:purge')->dailyAt('03:00');