Accelerating　carrier　transfer　and　increasing　active　surface　sites　are　key　to　boosting　hydrogen　production　in　composite　photocatalysts.　This　study　introduces　a　novel　phosphorus-modified　MOF-derived　cobalt/carbon　cocatalyst,　CoPC,　as　a　viable　alternative　to　noble　metals　like　platinum　and　palladium.　CoPC　significantly　enhances　the　photocatalytic　performance　of　ZnIn2S4　(ZIS)　under　low-power　visible　light,　achieving　a　hydrogen　production　rate　of　2.1　mmol　g-　1　h-　1,　over　seven　times　that　of　pure　ZnIn2S4.　CoPC＇s　metallic　properties　improve　charge　carrier　separation　efficiency　and　offer　additional　active　sites,　boosting　the　photocatalytic　water-splitting　efficiency　of　the　ZnIn2S4-CoPC　system.