Water-cooled plasma torch head

The utility model discloses a water-cooled plasma torch head, and belongs to the technical field of plasma torches. According to the plasma torch head, an inner spiral flow channel and a linear channel between the inner wall of the cathode sleeve and the outer wall of the outer spiral guide pipe are communicated to form an inner cooling flow channel, and an outer cooling flow channel is formed between the outer wall of the cathode sleeve and the inner wall of the outer sleeve in the spiral direction of the spiral guide piece. Due to the spiral flow channel design, the heat exchange time can be prolonged, and a cooling medium can take away more heat generated by the emitting electrode; the inside and the outside of the electrode are cooled, so that the heat exchange area is increased, and the heat dissipation of the electrode caused by the increased heat exchange area is highlighted; due to different spiral angles, the flow resistance of a fluid medium can be changed, and the heat exchange time is prolonged an