The invention discloses a double-recording video synthesis method of self-service equipment and a double-
recording system thereof. The double-recording video synthesis method comprises the steps of: verifying identity validity of a user, if the identity is valid, starting double-recording 
video recording to obtain a video file; and finally, encrypting the video file and transmitting the encryptedvideo file to the 
server, wherein collected identity card information is added into a 
video image in the recording process, a field name mark is generated in the 
video image, 
watermark information isadded into video data by adopting a 
digital watermarking technology, and the 
watermark information at least comprises face feature 
encryption information and identity card signature information. According to the double-recording video synthesis method, the 
client identity card information, 
client service website information and other information required by auditing of the double-recording systemare automatically captured and added into the video recorded in real time, integrated auditing video information is generated, the background personnel is facilitated to perform one-time auditing, andthe effectiveness of 
video recording is improved; and meanwhile, the synthesized video is processed by means of 
encryption and the like, so that the video is not tampered, and the safety performanceis improved.