Laser spray pipe and laser processing equipment

The utility model relates to a laser spraying pipe and laser machining equipment. The laser spraying pipe comprises a primary convergence part, a secondary convergence part coaxially connected with the primary convergence part, a primary expansion part and a secondary expansion part. The first flow channel of the primary convergence part and the second flow channel of the secondary convergence part are both spaces defined by convergent arc revolution curved surfaces, the third flow channel of the primary expansion part and the fourth flow channel of the secondary expansion part are both spaces defined by expanded arc revolution curved surfaces, and the connecting curved surface of the tail end of the second flow channel and the head end of the third flow channel is a throat part. According to the laser spraying pipe, under the condition that complex flow channel curved surface processes such as high-order curves and feature fitting are not involved, the arc revolution curved surface design is used for replace