The working principle of the metal laser cutting machine is based on the high energy density pulsed laser beam to locally heat the material in a small area, so that the material quickly melts or vaporizes. By high pressure gas blowing away the molten material, forming holes and small pits and other defects, so as to achieve the purpose of cutting off the material. This processing method not only cuts fast, but also has a small heat-affected zone, high processing precision and smooth cutting surface.