进入微信群，然后发公告，就可以@所有了。
1、打开微信群，然后点击右上角的三点。
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2、进入聊天信息页面，点击群公告。
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3、进入群公告后，输入信息，然后点击完成。
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4、点击完成后，就会提示该公告会通知全群成员，点击发布。
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5、发布后，就可以@所有人了。
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注意事项：
直接输入一个@符号只可以一个一个@，要@所有人只能发公告。