The invention provides a double
airflow supersonic
plasma spray gun comprising a
cathode rod, an arcing intermediate pole, an acceleration intermediate pole and an
anode. Theanode is provided with a
powder feeding mouth. The arcing intermediate pole, the acceleration intermediate pole and the
anode are internally and coaxially provided with cavity channels which are communicated with each other and used for penetration of
plasma airflow. The
cathode rod is arranged in an insulated rear base. One end, which is close to the arcing intermediate pole, of the
cathode rod is provided with a
tungsten cathode and an
argon gas distribution ring which is used for
piping of
argon. The insulated rear base is internally provided with a
high frequency generator connector and an
argon input channel which is communicated with the
argon gas distribution ring. The arcing intermediate pole and the acceleration intermediate pole are arranged on an intermediate pole base, and an air gas distribution ring used for
piping of
mixed gas formed by air and
combustible gas is arranged between the arcing intermediate pole and the acceleration intermediate pole. A problem of short service life of the cathode of pure air supersonic
plasma equipment is solved, and production cost is greatly reduced in comparison with that of pure argon supersonic plasma equipment. Besides, plasma temperature and speed can be adjusted through ratio of air to
combustible gas so that technology performance is high.