Coaxial micro-arc cathode discharge plasma propulsion device

The invention discloses a coaxial micro-arc cathode discharge plasma propulsion device. The coaxial micro-arc cathode discharge plasma propulsion device comprises a shell, an insulated support, insolated ceramics, a metal cathode, a metal anode and a spring, wherein the metal anode is sleeved in the insulated ceramics; the inner wall of the insulated ceramics is connected with the metal anode; the other end of the insulated ceramics is connected with a round boss of the metal anode, and the other end of the insulated ceramics is sleeved in the inner cavity of the insulated support; the insulated ceramics is sleeved in the metal cathode; the spring is arranged between the metal cathode and the insulated support; the metal cathode, the insulated ceramics and the metal anode are arranged in the shell; one end of the metal cathode clings to an annular bulge on the inner wall surface of the shell, and the other end of the metal cathode presses tightly against the spring; the other end of the insulated support is fixedly connected with the other end of the shell; when an external power control unit is controlled to discharge, the metal cathode is ablated to generate high-density plasmoids; and the high-density plasmoids fly out at high speed through the end surface of the shell 1, and then is ejected out in an accelerated manner through a magnetic field generated by a permanent magnet to generate propulsion force.