one
You can check first to see if there is a problem with no charging head and data cable; It is also possible that the phone does not recognize the fast charge function of the charger;
two
First turn off the battery of the phone until the automatic shutdown, and then plug in the original charger to charge, do not turn on and keep the shutdown charging, until the breath light turns green and 100% power before turning on. Slow charging no fast charging may be that your phone is charging by usb charging, the above method can be switched to AC charging (that is, fast charging);
three
Enter the [Settings] - [About the phone] - [MIUI version] of the phone, and then click 5 times in a row, you can open the [developer options], close the USB debugging, revoke all USB debugging authorization, and then return to the status information in the setting to see whether it is in AC power charging;
four
If you still can't use the fast charge, you can only get the phone to the after-sales point for maintenance.
It should be replaced by an ordinary data cable, and fast charging requires that the head and line are compatible with fast charging