Using cadmium nitrate, dimethyl sulfoxide, antimony trioxide, nitric acid, ferric nitrate and citric acid as raw materials, a series of CdS/YFeO₃ composite magnetic photocatalysts have been synthetized by co-precipitation method. They are been characterized by TG-DTA, UV-vis diffuse reflection, FL XRD and UV-vis. The TG-DTA results show that thermal stability of CdS/YFeO₃ composite magnetic photocatalyst is higher than of CdS. The uv-vis diffuse reflection tests prove that the absorbance of composite magnetic photocatalysts is increase than of pure CdS. The FL and XRD show that the synthetic catalysts are the target catalyst. The activity of the composite magnetic photocatalysts has been examined by catalytic degrading rhodamine B solution under visible light irradiation, which show that the photocatalysts have good catalytic activity. The material proportion of CdS and YFeO₃ significantly affects the photocatalytic activity of the photocatalysts. By the cycle and recovery experiment, the magnetic photocatalysts reveal a good repeatability and recovery, the recovery rate of catalysts is 92.08%.