The bank requires a copy of the household registration book to verify the personal identity and basic information of the customer. Banks need to verify the identity and residence of customers when handling certain businesses, such as opening accounts, handling loans and applying for credit cards. As a common certificate for identity identification and personal information verification, the household registration book can provide important information such as the customer's name, gender, date of birth and residence, which is helpful to ensure the compliance and safety of account opening or other business handling.