Chrome 55以后已经去掉了，具体见：https://bugs.chromium.org/p/c...。

如果需要可以安装第三方扩展Set Character Encoding。

参考：https://productforums.google....
55之后不提供这个选项，如果需要，请去找extension

Chrome 55 has removed the Encoding menu and Chrome will do
auto-encoding detection now:

https://bugs.chromium.org/p/c... - Remove
encoding menu

Manual encoding selection is not necessary any more as the new
encoding detector is turned on by default.

Manual encoding switching may be able to be done by use of Chrome
extensions.

Marked as best answer by Kameron M - Community Manager

"Default encoding" selector buried in chrome://settings. This
specifies which encoding is selected if "Auto Detect" is disabled and
the web page doesn't specify its encoding. It defaults to the UI
language of the Chrome installation.

楼上几位没谈解决方法，现阶段，只能修改默认编码来解决了，当然换浏览器也是可行的。