magnetic polymer microbeads and a method for preparing the same are provided . the method for preparing the magnetic polymer microbeads includes the following steps : preparing polymer particles ; immersing the polymer particles into a solution in order to swell the polymer particles ; adding magnetic nanoparticles to the solution and allowing the magnetic nanoparticlse to enter an interior of the polymer particles ; and separating the polymer particles from the solution , wherein the polymer particle is made of polystyrene , or a copolymer containing styrene , and the solution includes a medium polar solvent . the average particle size of the magnetic polymer microbeads of the present invention ranges from submicrons to microns . the magnetic polymer microbeads of the present invention have high magnetization , and the various functional groups can be introduced onto the surfaces thereof . therefore , the magnetic polymer microbeads of the present invention can be applied in many areas , and thereby they have high economic value .