打开cmd：mysql -u root -p


输入密码root


进入mysql依次执行下面语句

ALTER USER'root'@'localhost' IDENTIFIED BY 'root' PASSWORD EXPIRE NEVER; #修改加密规则 

ALTER USER'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root'; #更新一下用户的密码 

FLUSH PRIVILEGES; #刷新权限

重置密码：alter user'root'@'localhost' identified by 'root';