After i installed kali linux the wifi will turn off . and when i disconnect my pc the wifi works again

Whiat have you tried:

What is the error:

What device is this on:

What WiFi chipset?
any error messages?

post to vague to be able to help you at all, more info needed.

what have you tried, its blank!
error, blank…
device… no idea…

sorry
wifi chispset : Realtek Semiconductor Co., Ltd.
i’ve tried changing mode but still not working

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Is this a built in chipset and Kali installed direct on hardware, or are you using a VM and a USB adapter?

Realtek are problematic with Linux generally, unfortunately, I used to use them and you could get them working after jumping through lots of hoops, but they were never straightforward…

it’s built in chipset , what 's the solution then

Identify the exact chipset,

Realtek Semiconductor Co., Ltd.

This is not specific enough, there are lots if chipsets build by them.

As you were told, many realtek chips have very bad support for linux, so until we know which chipset exactly is being used, we can not be certain whether there even is a solution.

If its a built in adapter use the lshw (list hardware) command to find more information, this will tell you the exact chipset being used.

sudo lshw -C network