The invention relates to the technical field of surface cleaning, in particular to a composite cleaning method and device. The device mainly comprises a laser generator, an ultrasonic wave generationdevice and a unified moving platform. The laser generator and the ultrasonic wave generation device are fixed to the unified moving platform. The upper end of the ultrasonic wave generation device isprovided with an opening. During cleaning, a workpiece is put into the ultrasonic wave generation device, cleaning liquid is added, and after the positions of the laser generator and the workpiece areadjusted, cleaning is started. According to the composite cleaning method and device, through the composite ultrasonic and laser cleaning method, high-frequency ultrasonic vibration perpendicular tothe surface of the workpiece is applied to the workpiece in the laser cleaning process, the air convection coefficient of an action zone is increased, the dirt peeling and disengaging speed is increased, the cleaning quality is improved, and the cleaning speed is increased, so that the problems that existing cleaning methods and cleaning devices are low in cleaning efficiency and unthorough in cleaning are solved.