Photocatalytic degradation of organic pollutants from water bodies can efficiently reduce the organic pollutants in wastewater, which has broad application prospects. In this study, using CoFe_1.95Sm_0.05O₄ as a support, the Z-scheme heterojunction Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ was synthesized through a facile in situ deposition method followed by photo-reduction. Microstructure, phase structure, optical and magnetic properties of the samples were analyzed. Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ composite exhibited the highest catalytic activity, which dynamic constant (k) was 1.96, 2.71 and 7.24 times higher than those of Ag₂S/Ag, Ag₂S and CoFe_1.95Sm_0.05O₄, respectively. Introduction of CoFe_1.95Sm_0.05O₄ could ef?ciently promote the separation ef?ciency of photogenerated charge carriers in Ag₂S/Ag. And ?O₂^-and ?OH^- were proved to be the main active substances in the photocatalytic process. In addition, the as-prepared Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ composite could be quickly separated from the solution by an extra magnetic field after the photocatalytic reaction. Cyclic photodegradation test showed that the Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ hybrid materials had the stable degradation ability and crystal structures in the photodegradation process. This research provides a useful approach to develop photocatalysts with high efficiency, narrow band gap and magnetism.