My iPhone won’t charge

If the charging port is damaged, your device probably needs service. Let your device charge for a half hour. If your device is still unresponsive, force restart your device: iPhone 8 or later and iPhone SE (2nd generation): Press and quickly release the volume up button.

If your iPhone or iPod touch won't charge - Apple Support (IN)

Are you using the Apple USB cable and is the power adapter also made by Apple?

Did you check if the charging port is free of any debris or lint?

If it does not charge after being connected for 20min, you'll have to get it diagnosed by an Authorized Apple Service Provider:

Apple - Find Locations

are you turn on the switch?

How old is the iPhone? Depending on the age and use, your battery might be defective.