The principle of the ultrasonic food cutter is that the 50/60 Hz current is converted into 20, 30 or 40 kHz electrical energy by an ultrasonic generator (ultrasonic power supply). The converted high-frequency electrical energy is converted again into mechanical vibration of the same frequency through a transducer, and the mechanical vibration is then transmitted to the cutting knife through a set of amplitude can be changed by the amplifier device.