The invention provides a user registration authentication method and a system based on facial features. The user registration authentication method is characterized by comprising the following steps: (1) obtaining a facial picture through a camera, conducting AdaBoost detection, gray level conversion and Gabor filtering to the facial picture, and obtaining facial information, (2) generating a login name and a secret key through combination of the new facial information input by a user and a realm name, and filling the login name and the secret key into a login form, and (3) when the user logs in, requiring content of the login form according the facial information, detecting whether the user is a registered user, if the user is the registered user, logging in successfully, modifying the secret key, and if the user is a unregistered user, conducting the step (1). According to the user registration authentication method and the system based on the facial features, the facial information and a secret system are combined, the process of authentication identification is enabled to be guaranteed, and meanwhile convenience is brought to use.