Ultrasonic-assisted laser underwater cleaning device and method

The invention discloses an ultrasonic-assisted laser underwater cleaning device and method. A cleaning machining module comprises a workpiece, a water box and a flat field focusing lens, the workpieceis arranged under water in the water box, and the flat field focusing lens is arranged above the surface of the water; a working module comprises a platform capable of moving on a platform in the X/Ydirection, and the water box is placed on the platform; an ultrasonic energy module comprises an ultrasonic transducer, and the ultrasonic transducer is attached to the water box; a laser scanning module comprises a galvanometer and a polygonal scanning reflecting mirror, the polygonal scanning reflecting mirror is rotatably arranged above the flat field focusing lens, and the galvanometer is arranged corresponding to the polygonal scanning reflecting mirror; the galvanometer reflects incident laser beams towards the polygonal scanning reflecting mirror, the polygonal scanning reflecting mirror, reflects the incident