错误提示如下图所示

打开cmd：mysql -uroot -p

1：进入mysql依次执行下面语句 ： 

ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

2：修改加密规则：   

 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

3：更新一下用户的密码 :

FLUSH PRIVILEGES;

4：刷新权限 :

alter user 'root'@'localhost' identified by 'hxzk';

重置密码，hxzk就是变更后的密码