Cutting head apparatus for numerical control laser cutting machine tool

The utility model provides a cutting head apparatus for numerical control laser cutting machine and comprises focusing mirror components and a nozzle component; two independent focusing mirror components are arranged in a guard ring of a mirror seat over the nozzle component with the same axis, and the side wall of the guard ring of the mirror seat is provided with a window for mounting and pulling the focusing mirror components; the focusing mirror components are connected with the guard ring of a mirror seat through location screws, and the upper inner wall of the focusing mirror components are provided with a water-cooling annular cooling chamber, a water inlet, and a water outlet. The focusing mirror component comprises a seat (2-9), a planoconvex lens (2-9.1), a pressing ring (2-9.2), a mirror coat (2-9.3), an imbedded handle (2-23) outside the seat (2-9), and the imbedded handle (2-23) is provided with a thread sleeve (2-25); an waist-round hole (2-9.4) outside the seat (2-9) covers on the imbedded handle (2-23), and the thread sleeve (2-25) matches with the location screw 2-10 that is used to fix the focusing mirror components on the guard ring of the mirror seat.