Auxiliary cutting device for ultrasonic knife and ultrasonic knife cutting system

The invention provides a cutting auxiliary device for an ultrasonic knife and an ultrasonic knife cutting system, and relates to the technical field of medical instruments. The cutting auxiliary device comprises a fixing frame, a moving part and a driving part, and the fixing frame is provided with a track extending along a preset path; the moving part comprises a main body, a positioning part used for moving along the track and a mounting part used for mounting the ultrasonic knife, and the positioning part and the mounting part are arranged on the main body; the driving piece is connected to the fixing frame and provided with a driving part used for being connected with the main body. During an operation, the driving part can move relative to the fixing frame so as to drive the main body to move through the driving part, so that the positioning part moves along the track, and the ultrasonic knife is driven to move along a to-be-cut path limited by the track. Due to the fact that the shape of the track is fi