composites were successfully prepared via an ion-exchange deposition process. With Rhodmine B (RhB) as the model organic pollutant, Ag₃PO₄@MgFe₂O₄ system exhibited much superior degradation performance and stability, which was comparative to Ag₃PO₄ and MgFe₂O₄ system. The characterization results showed that Ag₃PO₄@MgFe₂O₄(10%) possessed high dispersion, large pore size (∼24 nm), larger transient photocurrent and longer fluorescence lifetime (∼10.83 ns). Furthermore, the effect of various parameters, such as temperature, initial pH, RhB concentration and catalyst loading on the RhB degradation were discussed in detail. Characterization results further indicate the MgFe₂O₄ over Ag₃PO₄ surface can inhibit Ag₃PO₄ from photocorrosion. Comparing the activity results dependence with the characterization results, it was indicated that the dependence of the photocatalytic activity on the efficient separation of photogenerated h⁺-e^- pairs. This result indicates that the Ag₃PO₄@MgFe₂O₄(10%) catalyst can be a promising candidate for organic dyes degradation in waste water.