Abstract: The nano-sized CeO₂/graphene catalyst was synthesized by hydrothermal method using bean sprouts with rich and graded porous structure as template. XRD, Raman spectroscopy, TEM, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis/DRS) were adopted to characterize the structure and morphology of CeO₂/graphene catalyst, as well as the photocatalytic performance. The results show that the prepared CeO₂/graphene photocatalyst not only inherits the characteristics of high porosity and large specific surface area of bean sprouts, but also maintains the morphological and microscopic characteristics of bean sprouts. The catalyst is composed of about 5.6 nm CeO₂ nanocrystals combined with a biologically morphic bionic graphene sheet structure. The as-prepared CeO₂/graphene composite possesses a large number of nanopores formed by the accumulation of catalyst nanoparticles, and their pore sizes distribute at about 15-45 nm, which makes the CeO₂/graphene catalyst have large specific surface area and improves the capture of the photo-generated electron-hole pairs ability. The visible light utilization efficiency of CeO₂/graphene composites is significantly enhanced by the UV-visible diffuse reflectance spectrum, and 671 μmol(h·g)^-1 is obtained after 6 h of photolytic water, which is much higher than that of the standard CeO₂ of 51.67 μmol(h·g)^-1.