A　magnetically　recoverable　gamma-Fe2O3/Ag/AgCl/g-C3N4　nanocomposite　was　successfully　synthesized　by　a　combination　of　the　solvothermal　method　and　photodeposition　approach.　The　obtained　nanocomposite　was　characterized　by　HRTEM,　SEM,　XRD,　PL,　XPS,　BET,　VSM　and　DRS　analyses,　and　the　photocatalytic　antibacterial　performance　of　the　sample　was　evaluated　by　the　inactivation　of　Escherichia　Coll　(E.　coil)　beneath　visible-light　irradiation.　The　results　showed　that　the　gamma-Fe2O3/Ag/AgCl/g-C3N4　nanocomposite　exhibited　a　potent　bacteria　disinfection　activity　and　that　the　quantity　of　viable　bacteria　was　nearly　inactivate　after　being　illuminated　for　1　h.　The　reactive　species　scavenging　experiments　revealed　that　the　hydroxyl　radical　and　hydrogen　peroxide　played　the　most　important　roles　in　the　photocatalytic　bacterial　inactivation.　During　the　photocatalytic　process,　the　relative　differences　between　the　conduction　band　and　valence　band　potentials　of　four　materials　(gamma-Fe2O3,　Ag,　AgCl,　and　g-C3N4)　promoted　the　continuous　transfer　of　photogenerated　electrons,　which　suppressed　the　recombination　of　electron-hole　pairs　and　enhanced　the　photocatalytic　antibacterial　activity　under　visible-light　irradiation.