Computer system and user identity recognition method and device thereof

The invention discloses a computer system and a user identity recognition method and device thereof. The computer system comprises a shell, a display screen is fixedly installed in the shell, a high-definition camera is fixedly installed at the top of the front face of the shell, and a face recognizer is fixedly installed at the top of the front face of the shell. User registration is carried out through a user registration module in a user login management unit, after registration is completed, an identity recognition mode is selected through a user recognition module, a face recognizer can be automatically started when a face recognition module is selected, face identity recognition is carried out on a user, and a fingerprint recognizer can be automatically started when a fingerprint recognition module is selected. A user can place a finger on the surface of the fingerprint recognizer for fingerprint recognition, the card recognition scanner can be automatically started when the card reading module is selec