Abstract: In the present ultrasonic cleaning machine, a group of transducers are usually arranged at the bottom of a flat cleaning tank, but this method will form a standing wave phenomenon that is not conducive to ultrasonic cleaning. To solve this problem, a spherical focused ultrasonic cleaning method is proposed, which can improve the efficiency of ultrasonic cleaning compared with ordinary flat arrangement. In this paper, the finite element software COMSOL Multiphysics is used to analyze the sound field in the cleaning machine, and the sound pressure distribution in the three-dimensional model is obtained. A focused ultrasonic cleaning machine is built, and the sound pressure distribution inside the cleaning machine is verified through the film corrosion experiment. It is found that the speed of removing oil stains of the focused ultrasonic cleaning is 77.27% higher than that of the ordinary ultrasonic cleaning. The film corrosion experiment and ultrasonic cleaning experiment show that the sound field in the focused ultrasonic cleaning machine is evenly distributed, and there is an energy focusing area in the sound field, and the cleaning rate is higher than that of the ordinary ultrasonic cleaning machine.