The invention relates to biological affinitive hydrophilic modified magnetic filler applied in the field of wastewater treatment. The biological affinitive hydrophilic modified magnetic filler comprises the following raw materials: 78%-82% of polypropylene, 6%-8% of polyvinyl alcohol, 2%-4% of active carbon powder, 2%-3% of modified heavy calcium carbonate powder, 2% of hydroxyapatite, 1.6% of stearic acid, 0.4% of white mineral oil and 4% of modified barium ferrite magnetic powder. According to the biological affinitive hydrophilic modified magnetic filler, a biological hydrophilic macromolecular material-polyvinyl alcohol is mainly introduced, so that the pollutant adsorption performance can be improved; the hydroxyapatite is introduced, so that the bioactivity can be improved, a proper nutritional source is provided for microorganisms, the hydrophilicity of the filler is improved, the biofilm formation starting speed is increased, and the wastewater treatment efficiency is improved; the modified barium ferrite magnetic powder containing rare metal is introduced, so that a microscopic high-intensity magnetic field and a macroscopic low-intensity magnetic field are formed, the adsorption effect of degradation bacteria on the surface of the filler is enhanced, and then the biofilm formation speed and the wastewater degradation speed of the filler in wastewater treatment are increased.