Abstract: A plasma generator comprises a discharge chamber provided with a means for introducing a plasma-forming medium and associated with a cathode assembly and an anode assembly. The latter includes at least two plasmatrons each having a hole for an inlet for the plasma-forming medium and being provided with an end electrode and an auxiliary hollow electrode. These electrodes are connected to an arc discharge initiating system. The exit openings of the auxiliary electrodes communicate with the discharge chamber and are evenly distributed along the perimeter of its cross section. The cathode assembly comprises at least two plasmatrons each having an inlet for the plasma-forming medium and being provided with an end electrode and an auxiliary hollow electrode. Both electrodes are connected to an arc discharge initiating system. In addition, the end electrodes are connected to the power supply.