Layered　graphene-based　composite　filtration　membranes　with　interlayer　photocatalysis　activity　have　been　successfully　prepared　by　in　situ　photo-induced　reduction　of　graphene　oxide-TiO2　membranes.　Owing　to　the　mild　reduction　conditions　as　well　as　the　unique　properties　of　graphene-based　sheets,　the　filtration　performance　of　separation　channels　in　membranes　after　in　situ　reduction　is　not　only　well　preserved,　but　also　additionally　improved.　Both　the　water　flux　and　retention　ratio　of　these　graphene-based　membranes　are　improved　obviously　compared　with　those　of　the　original　graphene　oxide　ones.　Moreover,　the　plane　separation　channels　in　the　membranes　can　also　be　endowed　with　additional　photocatalytic　function　by　the　assembled　TiO2　semiconductor　supports　between　the　surface　membranes.　Thus,　when　the　filtration　experiments　are　carried　out　under　concurrent　light　irradiation,　some　pollutants　penetrating　into　the　channel　due　to　the　membrane＇s　trade-off　effect　are　further　purified　by　photocatalysis,　which　further　improves　the　performance　in　wastewater　treatment　of　these　graphene-based　stacked　filtration　membranes.　©　2019　The　Royal　Society　of　Chemistry.