The invention discloses a vehicle-mounted identification and authentication device, a mobile terminal and an intelligent vehicle key control system and method. The intelligent vehicle key control system comprises the vehicle-mounted identification and authentication device and the mobile terminal. The vehicle-mounted identification and authentication device comprises an obtaining module, a wireless communication module and an identification module. The mobile terminal comprises an authentication module. The obtaining module is used for obtaining facial images. The identification module is used for identifying and authenticating the obtained facial images according to pre-stored identification parameters, and if authentication fails, the facial images are sent to the mobile terminal through the wireless communication module and the authentication result is obtained according to feedback information of the mobile terminal. The authentication module is used for receiving and displaying the facial images and sending the feedback information such as new user registration authorization and registered user authorization or authorization refusal to the vehicle-mounted identification and authentication device. Therefore, the aim of remotely controlling the facial identification and authentication function of the vehicle-mounted identification and authentication device is achieved, and convenience is improved.