The invention discloses a three-dimensional magnetic field generator, comprising a soft magnetic layer made from a soft magnetic material and a permanent-magnetism layer made from a permanent-magnetism material, wherein a center area of the permanent-magnetism layer is one magnetic pole, and the periphery area outside the center area is the other magnetic pole opposite to the magnetic pole of the center area. By utilizing the invention, the generated three-dimensional magnetic field has uniform distribution and big magnetic force.