The invention discloses a two-section Halbach permanent magnet motor with an optimal magnetization angle, which is characterized in that the optimal magnetization angle of a first permanent magnet section of the N-pole is an included angle of a magnetization direction and a clockwise circumference tangential direction; the optimal magnetization angle of a second permanent magnet section of the N-pole is an included angle between the magnetization direction and an anticlockwise circumference tangential direction; the optimal magnetization angle of a first permanent magnet section of the S-poleis an included angle between the magnetization direction and the anticlockwise circumference tangential direction; and the optimal magnetization angle of a second permanent magnet section of the S-pole is an included angle between the magnetization direction and the clockwise circumference tangential direction, and a rotor is matched with a corresponding stator to form a two-section Halbach permanent magnet motor with an optimal magnetization angle. The two-section Halbach permanent magnet motor can improve the radial air gap flux density fundamental wave amplitude and reduce a harmonic component of the air gap flux density, thereby being capable of outputting the torque at the same volume and cost. Therefore, the torque density and the power density of the kind of motors can be improved,and the scheme is also applicable to motor without a rotor core and external rotor motors.