The invention provides a rotor sectional-type flux-switching motor and a rotor deviation angle determining method of the rotor sectional-type flux-switching motor. Armature windings of stators of the sectional-type motor are formed by winding the same coil, and excitation directions of excitation sources at the same position of the stators are opposite to each other; rotors are of the same structure, however, a rotor deviation angle exists between protruding teeth of the different rotors. The rotor deviation angle determining method includes the steps that the relation between the total flux linkage amplitude, second harmonic amplitude and location torque peak-to-peak value of the sectional-type motor and the rotor deviation angle is acquired according to structure parameters of the first motor section, and then the needed rotor deviation angle is determined. By means of the method, torque pulsation is reduced, the flux linkage sine degree is improved, and flux linkage amplitude and torque output capacity is not affected; the method is suitable for flux-switching motors with various structures, and for motors in any exciting mode and with any number of stator poles and rotor poles, the motors can be high in flux linkage sine degree, large in flux linkage amplitude, small in location torque and high in torque density.