diff --git a/database/migrations/2026_04_17_160848_table_sub_ranks_add_item_id.php b/database/migrations/2026_04_17_160848_table_sub_ranks_add_item_id.php
new file mode 100644
index 0000000..60876cb
--- /dev/null
+++ b/database/migrations/2026_04_17_160848_table_sub_ranks_add_item_id.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class TableSubRanksAddItemId extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('sub_ranks', function (Blueprint $table) {
+            $table->string("item_id", 50)->nullable()->comment("道具ID")->after("rank_id");
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('sub_ranks', function (Blueprint $table) {
+            $table->dropColumn(["item_id"]);
+        });
+    }
+}