微信头像加上国旗需要在微信的“发现”菜单中，搜索头像小助手小程序，利用小程序上传需要添加的头像文件，选择“国旗”，导出保存到电脑，最后替换成微信头像即可，具体的操作方法如下：
1、打开手机微信，点击下方的“发现”。
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2、然后点击“小程序”，进入后点击上方的搜索框，输入“头像小助手”，点击搜索。
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3、接着选择第一项“头像小助手”，点击“头像加国旗”选项进入。
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4、进入后点击中间的“授权登录”，选择“允许”，点击右下角的“保存”。
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5、之后选择“允许”就可以将添加国旗的头像保存到手机相册了。
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6、最后回到微信“我”的页面，点击头像进入，将手机相册中刚刚保存的图片更换成自己的微信头像即可。
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注意事项：
1、在使用头像小助手工具时，应该上传正方形的头像文件，如果文件过大或者过小，都有可能会造成生成的头像不美观，影响效果；
2、在生成国旗头像时，可以利用手机自带的修图软件，对图片进行适当的修改，修改完成后再导入到小程序中进行生成。