How can I delete my card off my Apple account

Hello ~Take a look here:

Change, add, or remove Apple ID payment methods

~Katana-San~

Did you read the link posted above?

See the Apple Support article(s) below

Apple ID - If you can't remove your last payment method or use no payment method with your Apple ID  *

I want to remove my card on apple account

Hello ~ Take a look at the blue link above.

~Katana-San~