The invention discloses a rotor pole-staggering modularized outer rotor switch flux machine. The machine comprises two stators, two rotors and a set of winding, wherein the two stators are concentrically connected in the axial direction, the two rotors are staggered a mechanical angle corresponding to a half cycle of counter electromotive force, the winding comprises k winding modules, each winding module comprises m winding units, each winding unit comprises two winding coils, the two winding coils of each winding units are respectively embedded into four stator slots in a pair of stator units corresponding to the two stators, and polarities of a pair of permanent magnets, in the same winding coil, on the two stators are opposite. According to the machine, the two rotors are mutually staggered the mechanical angle corresponding to a half cycle of the counter electromotive force, the polarities of the permanent magnets, opposite to each other, on the two stators are opposite, under the condition that ensuring the effective values of an average output torque and the counter electromotive force are ensured to be constant, a cogging torque and an odd harmonic in torque ripple are reduced, and an even harmonic in the counter electromotive force is reduced.