You will still be able to have a bank account if you go bankrupt, but it will be a basic bank account.
Bankruptcy carries several restrictions that will affect the way you do your banking. You will have to have a basic bank account, which means you will not be allowed an overdraft or a cheque book. Some banks will allow you a basic debit card.
Your current bank may not allow you to remain with them once you have gone bankrupt (especially if you owe them money) so you may have to open an account at a different bank.