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CeO₂ mesoporous microspheres were synthesized by hydrothermal method and loaded with AgBr nanoparticles(NPs)on their surface. A small amount of Ag nanoparticles were obtained by <i>in-situ</i> reduction by photo deposition method to prepare CeO₂-Ag/AgBr heterostructure catalyst. CeO₂-Ag/AgBr samples were characterized by scanning electron microscopy (SEM), ultraviolet diffuse reflection (DRS), transmission electron microscopy (TEM), fluorescence spectroscopy (PL) and X-ray photoelectron spectroscopy(XPS).The photocatalytic performance of CeO₂-Ag/AgBr(CAAB) was investigated with Rhodamine B(RhB) as the target degradation material and xenon lamp (500 W). The results show that the photocatalytic activity of CAAB-3 (36.03%AgBr) is the highest. When the concentration of CAAB-3 is 5 mg/L, the degradation rate of RhB reaches 94.84% within 80 min, which is 22.3 times of the degradation capacity of CeO₂. After multiple cycles of experiments, the degradation rate of CAAB-3 remains stable at 88.55%. The plasma on resonance effect of Ag NPs reduces the recombination of electron holes and photogenic carriers and enhances the photocatalytic performance.