The invention discloses a safety authentication method. An authentication server receives a terminal use request sent by a first terminal, and the terminal use request comprises the first identification information of the first terminal and the second identification information of the second terminal. The authentication server judges the validity of the first identification information and the second identification information, and when the first identification information and the second identification information are valid at the same time, the authentication success of the terminal use request is determined. The invention also discloses a safety authentication device.