Laser cutting head

The invention provides a laser cutting head which comprises a base, a light inlet, a light outlet and a first laser channel used for laser transmission are formed in the base, one end of the laser channel communicates with the light inlet, and the other end of the laser channel communicates with the light outlet; the focusing assembly can be movably arranged in the first laser channel in the axial direction of the base and is used for focusing the laser entering from the light inlet and outputting the focused laser to the light outlet; the rotating assembly is in threaded connection with the focusing assembly, so that when the rotating assembly rotates, the focusing assembly is driven to move in the axial direction of the base to adjust the focal length of the focusing assembly; and the elastic piece is arranged between one end, far away from the light outlet, of the focusing assembly and the base. According to the laser cutting head, the thread fit clearance between the rotating assembly and the focusing ass