Hall thrustor based on magnetic focusing

A Hall thrustor based on magnetic focusing relates to a Hall thrustor and aims to resolve the problem that in an existing Hall thrustor, as high-energy ions sputter and force out wall surface materials, a ceramic wall surface of a channel is punctured, so that performances of the existing Hall thrustor are greatly changed, and finally the thrustor is failure. An anode is arranged in the middle of a discharge channel, and a cathode is arranged at an outlet of the discharge channel; an outer coil and an inner coil are symmetrically arranged on two sides of the outlet of the discharge channel, and respectively generate axial magnetic induction strength and radial magnetic induction strength; a slant angle of each magnetic line of force of magnetic field configurations generated by the outer coil and the inner coil is am, and two magnetic field configurations are generated by means of changing exciting current intensity of the outer coil 4 and the inner coil 5; if the magnetic lines of force are coincident to a radial direction, the am equals to 0 degrees; and if the magnetic lines of force are inclined to the direction of the anode 1, the am is smaller than 0 degree. A method of reducing erosion of a wall surface of the channel and prolonging the service life of the thrustor is realized by means of affecting sputtering parameters including ion flux, energy, incident angles and the like of a forced-out wall surface.