Double-closed-loop vector control ultrasonic saw cutting device

The utility model discloses an ultrasonic saw cutting device controlled by double closed-loop vectors. The problem that when materials difficult to saw are sawed, the sawing efficiency is low is solved. The saw cutting device comprises a feeding system and a saw cutting system, and further comprises an ultrasonic generator, a transducer amplitude-change pole, an encoder and a PID (Proportion Integration Differentiation) controller, the ultrasonic generator wirelessly transmits an ultrasonic frequency signal to the transducer amplitude-change pole, and the transducer amplitude-change pole receives the ultrasonic frequency transmitted by the ultrasonic generator and transmits the ultrasonic frequency signal to the PID controller. Radial ultrasonic mechanical vibration of the driving wheel and the driven wheel is generated; the encoder is arranged on the driving wheel and obtains the rotating speed of the driving wheel, the signal output end of the encoder is connected with the input end of the PID controller, a