The　photocatalyst　γ-Fe2O3/Ag/TiO2　with　highly　visible-light　response　was　synthesized　by　two-step　process.　The　photocatalytic　antibacterial　performance　under　visible　light　was　evaluated　by　the　lgReduction　on　the　E.　coli.　The　physical　and　chemical　properties　of　γ-Fe2O3/Ag/TiO2　were　analyzed　by　means　of　X-ray　powder　diffraction(XRD),　scanning　electron　microscopy(SEM),　X-ray　photoelectron　spectroscopy(XPS),　magnetic　property　measurement　system(MPMS)　and　other　characterization　methods.　The　results　indicate　that　the　catalyst　has　mesoporous　structure　with　a　specific　surface　area　of　89.1　m2/g　and　its　absorption　boundary　reaches　690　nm.　The　catalyst　exhibited　excellent　visible　light　response,　remarkable　antibacterial　properties　and　strong　magnetic　properties,　which　can　be　effectively　separated　and　reused　in　the　water　treatment.　The　optimal　preparation　parameters,　such　as　the　calcination　temperature,　the　calcination　time　and　n(Ti)/n(Ag)　were　determined　as　350℃,　3　h　and　1:　0.05,　respectively.　©　2019,　Higher　Education　Press.　All　right　reserved.