diff --git a/app/Http/Controllers/Admin/PlatformLeadController.php b/app/Http/Controllers/Admin/PlatformLeadController.php
index 29a356b..a836466 100644
--- a/app/Http/Controllers/Admin/PlatformLeadController.php
+++ b/app/Http/Controllers/Admin/PlatformLeadController.php
@@ -22,11 +22,18 @@ class PlatformLeadController extends Controller
         $filters = [
             'status' => trim((string) $request->query('status', '')),
             'keyword' => trim((string) $request->query('keyword', '')),
+            // 精确过滤：线索ID（用于从订单/运营动作回溯到某条线索）
+            'lead_id' => trim((string) $request->query('lead_id', '')),
         ];
 
         $query = PlatformLead::query();
 
         $query->when($filters['status'] !== '', fn (Builder $b) => $b->where('status', $filters['status']));
+
+        $query->when($filters['lead_id'] !== '' && ctype_digit($filters['lead_id']), function (Builder $b) use ($filters) {
+            $b->where('id', (int) $filters['lead_id']);
+        });
+
         $query->when($filters['keyword'] !== '', function (Builder $b) use ($filters) {
             $kw = $filters['keyword'];
             $b->where(function (Builder $q) use ($kw) {
diff --git a/resources/views/admin/platform_leads/index.blade.php b/resources/views/admin/platform_leads/index.blade.php
index a436e7f..dcdd974 100644
--- a/resources/views/admin/platform_leads/index.blade.php
+++ b/resources/views/admin/platform_leads/index.blade.php
@@ -63,6 +63,7 @@
             @endforeach
         </select>
         <input name="keyword" placeholder="关键词：姓名/手机号/邮箱/公司" value="{{ $filters['keyword'] ?? '' }}">
+        <input type="number" name="lead_id" placeholder="线索ID（可选）" value="{{ $filters['lead_id'] ?? '' }}">
         <div>
             <button type="submit">应用筛选</button>
         </div>
diff --git a/tests/Feature/AdminPlatformLeadIndexLeadIdFilterTest.php b/tests/Feature/AdminPlatformLeadIndexLeadIdFilterTest.php
new file mode 100644
index 0000000..60ca03e
--- /dev/null
+++ b/tests/Feature/AdminPlatformLeadIndexLeadIdFilterTest.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\PlatformLead;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class AdminPlatformLeadIndexLeadIdFilterTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_index_should_render_lead_id_filter_field(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $res = $this->get('/admin/platform-leads');
+        $res->assertOk();
+        $res->assertSee('name="lead_id"', false);
+    }
+
+    public function test_index_should_filter_by_lead_id(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $a = PlatformLead::query()->create([
+            'name' => '线索A',
+            'mobile' => '',
+            'email' => '',
+            'company' => '',
+            'source' => 'test',
+            'status' => 'new',
+            'plan_id' => null,
+            'meta' => ['from' => 'test'],
+        ]);
+
+        PlatformLead::query()->create([
+            'name' => '线索B',
+            'mobile' => '',
+            'email' => '',
+            'company' => '',
+            'source' => 'test',
+            'status' => 'new',
+            'plan_id' => null,
+            'meta' => ['from' => 'test'],
+        ]);
+
+        $res = $this->get('/admin/platform-leads?lead_id=' . $a->id);
+        $res->assertOk();
+        $res->assertSee((string) $a->id);
+        $res->assertSee('线索A');
+        $res->assertDontSee('线索B');
+    }
+}