Demagnetization method of permanent magnet and magnet

The invention provides a demagnetization method of a permanent magnet and the magnet. The demagnetization method comprises the steps that a first magnetic field is applied to the permanent magnet, a first preset angle is formed between the direction of the first magnetic field and the magnetization direction of the permanent magnet, and the first preset angle ranges from 90 degrees to 180 degrees; an alternating-current attenuation magnetic field is applied to the permanent magnet, a second preset angle is formed between the direction of the alternating-current attenuation magnetic field and the magnetization direction of the permanent magnet, and the second preset angle ranges from 45 degrees to 135 degrees. 本申请提供了一种永磁体的退磁方法及磁体。该退磁方法，包括：向所述永磁体施加第一磁场，其中所述第一磁场的方向与所述永磁体的磁化方向呈第一预定角度，所述第一预定角度为90-180°；以及向所述永磁体施加交流衰减磁场，其中所述交流衰减磁场的方向与所述永磁体的磁化方向呈第二预定角度，所述第二预定角度为45-135°。