The Ag/CeO2 photocatalyst was prepared by one-pot method, and the Ag/AgCl/CeO2 composite was further prepared by in-situ oxidation method. The structure and morphology of the Ag/AgCl/CeO2 composite nanomaterials were characterized by XRD and SEM. The photocatalytic properties of the composites were tested with organic dyes such as Orange II, Rhodamine 6G and temptation Red. The results showed that Ag/AgCl/CeO2 composite had the best photocatalytic performance when AgCl accounted for 80% of Ag/AgCl. After 6 min of simulated sunlight irradiation by xenon lamp, 93% of orange II could be degraded, and the degradation rate of Orange II could reach more than 90% within 8 min of 4 cycles. About 90% Rhodamine 6G and temptation Red can be degraded after 60 min of UV-VIS mixed light. The excellent photocatalytic activity of Ag/AgCl/CeO2 composites is mainly due to the localized surface plasmon resonance (SPR) of the precious metal Ag effects and metal/semiconductor heterostructure.