To　realize　the　rapid　separation　of　photogenerated　carriers　in　photocatalytic　reactions,　large-sized　porous　carbon　nanosheets　with　Pt　dots　were　utilized　as　cocatalysts　and　coupled　with　TiO2　particles　to　construct　photocatalytic　systems.　The　optimized　photocatalytic　H-2　yield　is　similar　to　108　times　higher　than　that　of　TiO2,　fully　demonstrating　the　important　role　of　large-sized　porous　carbon　nanosheets　with　Pt　dots　for　fast　charge　separation.　The　shift　of　the　main　peak　in　high-resolution　X-ray　photoelectron　spectroscopies　(XPS)　verifies　the　electron　transfer　from　TiO2　to　porous　carbon　nanosheets.　The　dense　distribution　of　photo-induced　Pt　deposition　on　porous　carbon　nanosheets　confirms　that　active　centers　for　H-2　evolution　are　mainly　located　on　porous　carbon　nanosheets.　Our　work　here　provides　the　practicability　of　constructing　large-sized　conductive　materials　as　cocatalysts　for　fast　charge　separation　in　photocatalytic　reactions.