Plasma torch (8; 10) of improved performances, comprising: an electrode (13) provided with a respective electrode head (18; 37); a nozzle (14); and an outside jacket (26), there being formed a first cooling circuit (20, 21) of a coolant for the electrode head (18; 37) having an end passage (22), said head being characterised in that it comprises a device (25) for disposing of the electrode heat, located inside of the first cooling circuit.