The frequency of conventional ultrasonic cleaning equipment is generally within the range of 20KHz-120KHz, and one equipment can only work near one frequency point. When the ultrasonic frequency is low, the wavelength is large, the cavitation bubble generated is thick, the strength is high, and the impact on the surface of the workpiece is large. In addition, because the wavelength is large, the uniformity of the sound field distribution in the cleaning tank is also poor, so the ultrasonic cleaning equipment with lower frequency is more suitable for cleaning workpieces with heavy dirt or difficult to clean. When the ultrasonic frequency is high, the wavelength is short, the cavitation bubble generated is fine, the strength is low, and the impact on the workpiece surface is small. Because the wavelength is small and the cavitation bubble is fine, the sound field distribution is more uniform, and the penetration of the acoustic wave is enhanced, and the dispersion and emulsification power of the fine dirt is also enhanced. Therefore, the ultrasonic cleaning equipment with higher frequency is more suitable for cleaning the workpieces with more precision, higher surface precision, and more complex shapes.