The　increasing　environmental　pollution　and　looming　energy　crisis　necessitate　the　development　of　advanced　photocatalysts　that　demonstrate　efficient　separation　and　transfer　of　the　photo-generated　holes　and　electrons,　as　well　as　multiple　functions　to　address　the　above　issues.　Herein,　a　bifunctional　Ni3S4/NiS2/v-Zn3In2S6　photocatalyst　has　been　constructed　to　degrade　environmental　hormones　and　antibiotics　with　simultaneous　H2　production.　Sulfur　vacancies　have　been　engineered　in　the　Zn3In2S6　from　a　kinetic　point　of　view　to　accelerate　the　separation　of　photogenerated　charge　carriers　and　act　as　active　sites.　Ni3S4　and　NiS2　are　introduced　to　construct　cascade　electric　fields　with　Zn3In2S6　via　ohmic　junctions　for　spatially　separated　charge　carriers　and　reduced　hydrogen　evolution　potential.　As　a　result,　the　composite　exhibits　enhanced　photocatalytic　H2　production　and　efficient　degradation　of　bisphenol　A,　norfloxacin,　and　tetracycline,　respectively.　Specifically,　the　degradation　pathways　of　BPA　have　been　investigated　based　on　Fukui　calculations　and　liquid　chromatography-mass　spectrometry　techniques.　This　work　may　shed　new　light　on　the　design　and　construction　of　dual-function　photocatalysts　for　wastewater　treatment　and　H2　production.