The　environmentally　friendly　disposal　of　antibiotic　wastewater　has　elicited　widespread　concern.　Herein,　lavender-like　WO3/ZnIn2S4　heterostructures　are　constructed　by　in-situ　anchoring　ZnIn2S4　nanosheets　onto　WO3　nanorods　and　applied　to　the　photocatalytic　degradation　of　tetracycline　(TC).　When　ZnIn2S4　and　WO3　are　successfully　coupled　at　a　molar　ratio　of　0.3:1,　the　resultant　product　WZ-3　exhibits　optimal　photocatalytic　performance,　which　is　4.7　and　1.5　times　higher　than　that　of　WO3　and　ZnIn2S4,　respectively.　Such　an　improvement　is　originated　from　the　enlarged　specific　surface　area,　increased　light　harvesting,　and　effective　carriers　separation　facilitated　by　the　formation　of　an　S-scheme　heterojunction,　which　is　corroborated　through　density　functional　theory　(DFT)　calculations　and　experimental　characterizations.　Moreover,　this　study　elucidates　the　mechanism　governing　TC　degradation,　including　its　degradation　pathways.