My iPhone is not charging and I don’t know why , please I need help

Angelinelove ~ What model of iPhone is it?...

Settings > General > About > Model Name

And does it still have its original battery?

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Check this link...

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

If that does not help, you may need to make an appointment at the nearest Apple Store for an evaluation and explanation of your options.

Apple Store - Find a Store - Apple