Magnetic MFe₂O₄ (M=Co, Zn)/reduced graphene oxide (MFe₂O₄/rGO) nanocomposites were prepared by using a solvothermal method. Physical and chemical properties of the nanocomposites were characterized. The effect of ethylenediamine tetraacetic acid (EDTA) ion on photo-Fenton catalytic activity of the magnetic MFe₂O₄ (M=Co, Zn) /reduced graphene oxide (rGO) composites was studied in detail. Photo-Fenton catalytic activity and recycling performance of the MFe₂O₄ (M=Zn, Co)-rGO+EDTA+H₂O₂ systems were evaluated through the degradation of different organic dyes under the irradiation of simulated sunlight at approximately neutral p H values. Comparatively, the MFe₂O₄ (M=Zn, Co)-rGO+EDTA+H₂O₂ systems exhibited enhanced catalytic degradation performance for both the cationic and anionic dyes. Moreover, photo-Fenton catalytic activity of the Zn Fe₂O₄-rGO+EDTA+H₂O₂ system was higher than that of the Co Fe₂O₄-rGO+EDTA+H₂O₂ system. The former had an Rh B degradation rate of up to 92.1% after 5 min of light exposure, which is the highest concentration of hydroxyl radicals (·OH) produced in the reaction system that accelerated the degradation of organic dyes. In addition, possible mechanism for the enhanced oxidization of organic dyes over the MFe₂O₄ (M=Zn, Co)-rGO+EDTA+H₂O₂ system was proposed according to the experimental results.