Solar-powered　photocatalytic　water　splitting　for　hydrogen　evolution　presents　a　promising　solution　to　the　energy　crisis　and　contemporary　environmental　challenges.　Herein,　a　Z-scheme　ZnS/LaTiO2N　heterojunction　composite,　incorporating　zinc　vacancies,　has　been　successfully　synthesized　to　enable　photocatalytic　hydrogen　evolution　under　visible-light　illumination.　The　optimized　ZnS(VZn)/LaTiO2N　composite　demonstrates　a　hydrogen　evolution　activity　13　times　higher　than　that　of　individual　ZnS(VZn).　The　heterojunction　between　ZnS　and　LaTiO2N,　in　conjunction　with　zinc　vacancies,　expands　the　photoresponse　spectrum　and　facilitates　the　spatial　separation　and　transfer　of　photogenerated　carriers.　Consequently,　this　synergy　significantly　enhances　the　performance　of　photocatalytic　hydrogen　evolution.　The　collaborative　action　of　the　Z-scheme　heterojunction　and　zinc　vacancies　paves　the　way　for　innovative　approaches　in　designing　future　high-efficiency　photocatalysts.