Laser cutting is achieved by applying high-power density energy generated by laser focusing. Under the control of a computer, the laser is discharged by pulses, thereby outputting controlled repetitive high-frequency pulse lasers to form a beam of a certain frequency and a certain pulse width. The pulsed laser beam is transmitted and reflected through the optical path and focused on the surface of the processed object through a focusing lens group, forming a fine, high-energy density spot. The focal spot is located near the surface to be processed, and the processed material is melted or vaporized at an instant high temperature. Each high-energy laser pulse instantly sputters a tiny hole on the surface of the object. Under computer control, the laser processing head and the processed material perform continuous relative motion and dotting according to the pre-drawn graphics, so that the object will be processed into the desired shape.