Developing　active　photocatalysts　using　wide-spectrum　light　is　crucial　to　promote　the　application　of　photocatalytic　water　splitting.　Elemental　red　phosphorus　(RP)　has　attracted　much　attention　as　a　potential　nonmetal　photocatalyst　owing　to　its　low　cost,　earth　abundance,　and　narrow　bandgap.　Herein,　RP　nano-sheets　were　synthesized　and　tightly　combined　with　carbon　nitride　(CN)　framework　nanosheets　to　form　RP/CN　van　der　Waals　(vdW)　heterostructure.　CN　nanosheets　could　act　as　a　substrate　to　generate　RP　nanosheets　through　a　＂confinement　effect＂.　This　hybrid　photocatalyst　could　utilize　the　incident　light　with　the　wavelength　longer　than　620　nm　for　pure　water　splitting,　with　hydrogen　production　activity　of　367.0　mu　mol　h(-1)g(-1)　under　full　arc　illustration　and　239.8　mu　mol　h(-1)g(-1)　under　visible　light　irradiation.　The　improved　photocatalytic　property　was　ascribed　to　the　wide　light　absorption　and　intimate　electronic　coupling　between　2D　RP　and　2D　CN　for　accelerated　charge　transfer.　Instead　of　O-2,　water　was　oxidized　into　H2O2　via　a　two-electron　pathway,　which　could　avoid　the　potential　explosion　by　producing　H-2　and　O-2　simultaneously.　This　work　proved　the　great　potential　of　RP-based　vdW　heterostructures　for　solar-driven　water　splitting.