Abstract: In order to remove MnO-4 from wastewater effectively,Fe3O4-RGO was synthesized by hydro-thermal method. SiO2 was introduced to modify Fe3O4 via the emulsion-gel method,and the adsorptionperformance of the material was enhanced by grafting EDTA. Finally,a magnetic nano-manganese re-moval agent Fe3O4@ SiO2@ EDTA-RGO was obtained. The morphology,crystal structure and magneticproperties were characterized by transmission electron microscopy ( TEM) ,X-ray diffraction ( XRD) ,and magnetic recovery experiment. The effects of adsorption time,adsorbent dosage and initial concen-tration on MnO-4 adsorption were investigated. The results showed that the adsorbent had good crystalstructure and regular morphology. Fe3O4@ SiO2,with an average particle size of about 108 nm,was uni-formly loaded on the surface of RGO without obvious agglomeration. When the adsorption time was 80min,the dosage of adsorbent was 0.5 mg and the initial concentration of MnO-4 solution was 3 mg /L,theadsorption effect was the best,and the adsorption reaction conformed to the pseudo -second -order362kinetic model. The removal rate of MnO-4 was still as high as 85.23% after 5 cycles of use. Close-