The invention discloses a multistage cusped magnetic field plasma thruster segmented ceramic channel, relates to the field of plasma thrusting, and aims to solve the problems of plume concussion of an outlet area of a multistage cusped magnetic field plasma thruster, large plume divergence angle, over-high wall temperature of a ceramic channel and low ionization rate. The front section of the ceramic channel is of a baffle structure, so that corrosion of the front end face of the thruster caused by electrons is decreased, the front section of the ceramic channel and an outlet permanent magnet form a magnet loop with a certain shielding function, the magnetic field intensity of the outlet plume area is reduced, the electrons more easily enter the channel to perform ionization, potential drop is concentrated in an outlet magnetic interface, the plume divergence angle is decreased, boron nitride ceramics of a middle section has a low secondary electron emission coefficient, the electron temperature and the ionization rate are high, heat insulation ceramics close to a rear section of an anodic area reduce anodic heat absorbed by the channel, the anodic heat is conducted and dissipated by the aid of an anodic bottom surface, heat dissipation of the permanent magnet is decreased, and demagnetization of the permanent magnet due to high temperature is avoided. The multistage cusped magnetic field plasma thruster segmented ceramic channel is applicable to the field of plasma thrusting.