The invention discloses a computer network protection method and system. The protection method comprises the following steps: A, a user enters a computer system through triple verification modes of fingerprint verification, face recognition and password verification, and if any of the verification goes wrong, the computer power is automatically turned off; B, after entering the system, the data inthe computer are automatically backed up; C, after the data are backed up, a virus detection system is entered to detect network virus; D, once a security hole is detected, an alarm signal is issued,meanwhile, the network is automatically disconnected and repaired; after the repair, the detection is performed again; if there is no loophole, the network is connected; E, finally, the computer dataare encrypted. The protection method adopted by the invention is simple in operation and high in security performance, effectively protects the data in the computer and ensures data safety.