登录手机QQ后选择设置，点击【聊天】后继续点击【清空所有聊天记录】就能删除聊天记录。下面是详细步骤：
工具/原料：华为P50、Harmony OS2.0、QQ8.8.50
1、登录手机QQ，向右滑动选择左下角“设置”。
2、找到“通用”，进入通用页面后，点击“聊天”。
3、进入“聊天”后，点击“删除所有聊天记录”，如下图所示。
4、点击确定，完成删除QQ聊天记录。
打开手机qq点击左上角qq头像，然后点击下方设置按钮；找到“通用-聊天”，选择删除所有聊天记录，点击确定即可。
工具/原料：手机，qq
步骤：
1、在手机QQ的消息界面，点击左上角箭头处QQ头像；
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2、在侧边栏后点击左下角箭头处的“设置”按钮；
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3、进入“设置”界面后，点击箭头处的“通用”按钮；
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4、进入“通用”界面后，点击箭头处的“聊天”按钮；
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5、进入“聊天”界面，点击箭头处“删除所有聊天记录”；
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6、点击箭头处的“确定”，即可删除所有的聊天记录。
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注意事项：
1、要删除单个好友的聊天记录，先找到该好友，再执行删除操作；
2、可以根据自己的需要，选择删除单个好友的聊天记录，或者删除所有聊天记录。
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