diff --git a/docs/en/social-media.md b/docs/en/social-media.md
index 0cc34b4d0d..0b286fbbe7 100644
--- a/docs/en/social-media.md
+++ b/docs/en/social-media.md
@@ -44,6 +44,10 @@ pageClass: routes
 
 </RouteEn>
 
+### Keyword
+
+<Route author="DIYgod" example="/pixiv/search/麻衣/popular/2" path="/pixiv/search/:keyword/:order?/:r18?" :paramsDesc="['keyword', 'rank mode, empty or other for time order, popular for popular order', 'filte R18 content, 0 to no filter, 1 to only not R18, 2 to only R18, default to 0']" radar="1"/>
+
 ## Telegram
 
 ### Channel
diff --git a/docs/social-media.md b/docs/social-media.md
index 9f63d3f233..4eebb2df88 100644
--- a/docs/social-media.md
+++ b/docs/social-media.md
@@ -322,7 +322,7 @@ Tiny Tiny RSS 会给所有 iframe 元素添加 `sandbox="allow-scripts"` 属性
 
 ### 关键词
 
-<Route author="DIYgod" example="/pixiv/search/麻衣/popular" path="/pixiv/search/:keyword/:order?" :paramsDesc="['关键词', '排序方式，popular 按热门度排序，空或其他任意值按时间排序']" radar="1"/>
+<Route author="DIYgod" example="/pixiv/search/麻衣/popular/2" path="/pixiv/search/:keyword/:order?/:r18?" :paramsDesc="['关键词', '排序方式，popular 按热门度排序，空或其他任意值按时间排序', '过滤 R18 内容，0 为不过滤，1 为只看非 R18 内容，2 为只看 R18 内容，默认为 0']" radar="1"/>
 
 ### 关注的新作品
 
diff --git a/lib/router.js b/lib/router.js
index 82c4d4e3b8..b03de77b90 100644
--- a/lib/router.js
+++ b/lib/router.js
@@ -142,7 +142,7 @@ router.get('/pixiv/user/bookmarks/:id', require('./routes/pixiv/bookmarks'));
 router.get('/pixiv/user/illustfollows', require('./routes/pixiv/illustfollow'));
 router.get('/pixiv/user/:id/', require('./routes/pixiv/user'));
 router.get('/pixiv/ranking/:mode/:date?', require('./routes/pixiv/ranking'));
-router.get('/pixiv/search/:keyword/:order?', require('./routes/pixiv/search'));
+router.get('/pixiv/search/:keyword/:order?/:r18?', require('./routes/pixiv/search'));
 
 // 豆瓣
 router.get('/douban/movie/playing', require('./routes/douban/playing'));
diff --git a/lib/routes/pixiv/search.js b/lib/routes/pixiv/search.js
index cae89c7548..57a539a790 100644
--- a/lib/routes/pixiv/search.js
+++ b/lib/routes/pixiv/search.js
@@ -10,6 +10,7 @@ module.exports = async (ctx) => {
 
     const keyword = ctx.params.keyword;
     const order = ctx.params.order || 'date';
+    const r18 = ctx.params.r18;
 
     if (!getToken()) {
         throw 'pixiv not login';
@@ -22,7 +23,12 @@ module.exports = async (ctx) => {
         response = await searchIllust(keyword, getToken());
     }
 
-    const illusts = response.data.illusts;
+    let illusts = response.data.illusts;
+    if (r18 === '1') {
+        illusts = illusts.filter((item) => item.x_restrict === 0);
+    } else if (r18 === '2') {
+        illusts = illusts.filter((item) => item.x_restrict === 1);
+    }
 
     ctx.state.data = {
         title: `${keyword} 的 pixiv ${order === 'popular' ? '热门' : ''}内容`,
@@ -44,5 +50,6 @@ module.exports = async (ctx) => {
                 link: `https://www.pixiv.net/member_illust.php?mode=medium&illust_id=${illust.id}`,
             };
         }),
+        allowEmpty: true,
     };
 };