Combining　enhanced　light　absorption　capacity　with　improved　directly　spatial　charge　separation　efficiency　remains　a　challenging　issue　for　the　development　of　efficient　photocatalysts.　Herein,　we　present　a　strategy　for　developing　anti-Z-scheme　poly(thiophene-co-3-ethylthiophene)/K+　implanted　polymeric　carbon　nitride　(PB-KCN)　heterojunctions,　which　integrates　the　two　crucial　factors　of　light　absorption　and　directly　spatial　charge　separation.　The　ratio-optimized　20　PB-KCN　exhibits　remarkable　visible-light-driven　hydrogen　production　activity　up　to　22.86　mmol/h　g(-1)　(similar　to　61.8　times　that　of　KCN)　with　a　recorded　apparent　quantum　yield　of　31.34　%　under　550　nm　irradiation.　Notably,　it　is　confirmed　that　the　efficient　photogenerated-carrier　separation　in　PB-KCN　heterojunctions　is　mainly　attributed　to　the　firstly　proved　anti-Z-scheme　electron　transition　with　the　electrons　in　the　HOMO　(highest　occupied　molecular　orbital)　of　PB　directly　excited　to　the　LUMO　(lowest　unoccupied　molecular　orbital)　of　KCN,　resulting　in　the　spatial　separation　of　photogenerated　carriers.　The　proposed　anti-Zscheme　heterojunction　solves　the　problem　that　traditional　heterojunctions　cannot　achieve　synchronous　enhancement　of　light　absorption　and　directly　spatial　charge　separation.