Abstract: TiO₂@Fe₃O₄ magnetic nanoparticles with core-shell structure was prepared by sol-gel method,and then TiO₂@Fe₃O₄/polypyrrole (PPy) magnetic ion exchange adsorption resin was prepared with PPy by chemical oxidation.The morphology and particle size of the samples were observed by TEM and SEM.The phase analysis was represented by XRD.The surface properties of the samples were represented by FTIR.VSM was used to determine the magnetic property.The absorbance could be represented by UV,and malachite green solution was used for the adsorption test.The results show that TiO₂@Fe₃O₄/PPy composite nanoparticles which are superparamagnetic unchanged,agglomeration is obviously improved, the magnetic intensity is about 5.384 emu·g^-1. When 0.05 g TiO₂@Fe₃O₄/PPy adsorbent is used to adsort 25 mL 20 mg·L^-1 malachite green solution (MG) at 298 K in the solution with pH=7,the saturated adsorption capacity of TiO₂@Fe₃O₄/PPy adsorbent can reach up to 312.50 mg·g^-1, and the removal rate of which can reach up to 99.1% within 30 min.Compared with the activated carbon,TiO₂@Fe₃O₄/PPy magnetic ion exchange adsorption resin can undertake large area dynamic exchange and adsorption,which illustrates that its adsorption propertities are better than that of the activated carbon.