Ultrasonic reinforcement online monitoring adjustment method and device as well as ultrasonic reinforcement device

The invention provides an ultrasonic reinforcement online monitoring adjustment method and device as well as an ultrasonic reinforcement device. The method comprises the steps of measuring a voltage and a current at two ends of an ultrasonic transducer in a working process in real time, and performing calculation according to the voltage and the current to obtain instantaneous load impedance in the working process; comparing the instantaneous load impedance with a pre-stored standard load impedance threshold, and obtaining an output control signal according to a comparison result; and according to the output control signal, controlling and adjusting the size of a processing gap between the ball end of an ultrasonic tool and a reinforced workpiece. According to embodiments of the invention, the defects of low adjusting efficiency, incapability of realizing fine control and poor reinforcement treatment effect in the prior art of adjusting the size of a processing gap between the ball end of an ultrasonic tool and a reinforced workpiece by virtue of experience of operators or by arranging a ruler are overcome.