Supersonic plasma spray gun

The utility model relates to the technical field of thermal spraying in surface engineering, in particular to a supersonic plasma spray gun, which comprises a cathode rod, a cathode head, a gun body, an anode nozzle, a powder delivery sleeve component, a nozzle pressure cap, a distribution ring and an insulating body. A compression section and a diffusion section of an inner hole of the anode nozzle adopt a Rafael curved surface, and the inner hole is smoothly connected. The supersonic plasma spray gun has a simple structure, high matching accuracy and good cooling effect. With the inner hole structure of the anode nozzle, the speed of spraying powder particles can be increased greatly, the supersonic effect can be achieved easily, and the performance of the coating can be improved.