Laser cleaning is a brand new non-contact surface cleaning technology. The technology mainly uses a continuous laser beam with high energy density to act on the surface of the work-piece, so that the surface stains, oxides or coatings are instantly evaporated and gasified or thermally expanded and separated , So as to achieve the effect of surface cleaning and purification (as shown below). Compared with the traditional method, it has the advantages of environmental protection, no grinding, no thermal effect, etc., and has special advantages in cleaning precision work-pieces.