A magnetic flux switch type axial magnetic field permanent magnet brushless machine relates to a double air gap permanent magnet machine composed of two stators (1) and a rotor (2), wherein the stators (1) and a rotor (2) are arranged axially; the rotor (2) is clamped between two stators (1); the air gap with certain thickness is arranged between the stator (1) and the rotor (2); each stator (1) is composed of 12 U-shaped stator cores (3), 12 sector permanent magnets (4) and 12 coil2 (5); the U-shaped stator cores (3) and the sector permanent magnets (4) are put alternately to constitute the disc; the U-shaped stator core (3) and the permanent magnet (4) are respectively corresponding on the two stators (1), but the magnetizing directions of the two corresponding permanent magnets are opposite. The simple structure advances the operation reliability and the dynamic performance of the motor, meanwhile the axial size is smaller, which is suitable for the place requiring the thin mount, such as the robot, the computer peripherals, the electric automobiles and the wind electric power generation and the like.