The working principle of a laser engraving machine is based on the irradiation of a laser beam, which causes the material to melt and vapor instantly, thus achieving the engraving effect. The laser beam is transmitted and focused on the surface of the material through an optical mechanism. The material at the point high energy density of the laser beam rapidly vaporizes, forming a depression. The computer controls the movement of the laser head, which scans line by line according to image information stored in the computer, achieving the engraving effect.