The development of network information technology has greatly improved the work efficiency and quality of banks, but at the same time, it has also brought unavoidable network information security problems. Facing the threat of network security problems, banks must implement network information security protection technology. Through the application of security protection technology, the bank's network information data can be comprehensively protected to avoid information leakage. This paper discusses the significance and principles of bank network information security protection, analyzes the main technical scheme of bank network information security protection at this stage, and promotes the development of bank network information office.