The rectorite-TiO2 thin film photocatalyst was prepared by rectorite and tetrabutyl titanate and immobilized on glass.The photocatalytic activities of rectorite-TiO2 thin film using for degradation of methyl orange under ultraviolet and solar light irradiation were investigated.The results indicated that the catalytic activities of rectorite-TiO2 thin film was better than that of TiO2 thin film under the same conditions of preparation.The catalytic activity was affected by the number of the layers of rectorite-TiO2 when preparing rectorite-TiO2 thin films.The decolorization rate of methyl orange can reach 52.9% by rectorite-TiO2 thin films under solar light irradiation for 7 hours.