My iPhone keep shutting off

We can't tell you why exactly. You could have a hardware problem. You could be out of storage on your device. Assuming it's not a hardware issue exactly, if your phone is out of memory, it can't operate normally and often devices which don't have memory available crash and restart.

To see if you have a storage issue, go to Settings > General > iPhone Storage and see how much memory you have available.

ellishia ~ What model iPhone is it?...

Settings > General > About > Model Name

What version of iOS is it running?

Settings > General > About > Software Version

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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ellishia208 wrote: "It is An iPhone SE"

Which model is it?...

iPhone SE (1st generation) released in 2016

iPhone SE (2nd generation) released in 2020

What version of iOS is it running?

Settings > General > About > Software Version

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Hello ~ What iPhone model and iOS? In the meantime take a look here:

Force restart iPhone - Apple Support

Update your iPhone, iPad, or iPod touch - Apple Support

~Katana-San~

Hello ~ Try and answer all of our questions so we may help you with your issue. Take a look here by clicking on the blue link:

Check the iPhone battery health and usage - Apple Support

~Katana-San~