iphone 5S is not charging after dropped down.

Hi,

Welcome to Apple Support Communities.

It sounds like there is an issue charging your iPhone. The article below provides the possible resolutions for a charging issue like the one you described.

iPhone and iPod touch: Charging the battery

http://support.apple.com/kb/HT1476

Resolving issues

If your battery doesn't charge, or if your device shows a low-battery image, black screen, or "accessory not supported" alert, follow these steps.

1. Inspect the connector at the bottom of the phone:
• Make sure that there are no bent pins in the connector.
• Make sure that the connector is free from debris.
• If there are bent pins or debris, please contact Apple Support.
• Otherwise, continue troubleshooting.
2. Make sure that the outlet you're using works.
3. Make sure that the Apple USB cable and Apple USB power adapter work.
4. Plug the device in to power and let it charge until your device turns on. This could take between 10 and 30 minutes. If you don't have an Apple USB power adapter, try connecting to a computer's high-power USB 2.0 port (not a keyboard). The computer must be on.
5. If the device still exhibits an issue, try turning your device off and then on again while connected to power.
6. If the issue persists, please contact Apple Support.

I hope this helps.

-Jason

It sounds like the phone got damaged. If none of the above helps take it into an Apple store or an authorized repair centre and have it tested.