The current conventional security authentication methods for power monitoring system operation and maintenance scenarios mainly verify the user's identity by means of certificate authentication or password authentication, which leads to poor recognition accuracy due to the lack of effective extraction of key user information. For that, the security authentication method of power monitoring system operation and maintenance scene based on face recognition and fingerprint recognition is proposed. The biometric information of staffs in power system operation and maintenance scenes is obtained through face detection and fingerprint morphological feature extraction. The security authentication protocol is also designed, and the data interaction behavior is encrypted in the form of session key, and the security authentication model is constructed on this basis. In the experiment, the designed security authentication method is tested for recognition effect. The final results can prove that when the proposed method is used to identify user personnel information in the power monitoring system, the identification accuracy is high and has a more desirable authentication effect.