The magnetic core-shell Fe3O4@SiO2@TiO2-Ce/rGO composite nanomaterials were prepared by sol-gel method and hydrothermal method, composite photocatalyst doped with metal and loaded with graphene, the catalytic activity has been greatly improved. Under normal experimental conditions (pH = 7, [MB] = 10mg/L, magnetic composite photocatalyst concentration = 0.1g/50mL), Fe3O4@SiO2@TiO2-Ce/rGO nano-composites photocatalyst maximum degrade MB reaches 98.2% in 140 minutes.