Semiconductor-based　photocatalytic　materials　have　emerged　as　promising　candidates　for　solar-driven　hydrogen　production　and　oxygen　evolution　reactions.　Direct　Z-scheme　photocatalysts　offer　competitive　advantages　that　are　superior　to　single-component　or　intensively　studied　heterojunction　photocatalysts　in　photocatalytic　water　splitting.　The　development　of　high-performance　direct　Z-scheme　photocatalysts　is　crucial　to　improving　solar-driven　water　splitting　efficiency.　Herein,　we　report　the　fabrication　of　a　novel　g-C3N4/MoS2/Ag3PO4　ternary　composite　and　its　application　in　photocatalytic　oxygen　evolution　under　white　light　LED　illumination.　As-exfoliated,　highly　conductive　two-dimensional　molybdenum　disulfide　(2D　MoS2)　nanoflakes　and　modified　graphitic　carbon　nitride　(g-C3N4)　nanosheets　were　employed　simultaneously　to　couple　with　oxygen-evolving　silver　orthophosphate　(Ag3PO4),　forming　a　dual　direct　Z-scheme　g-C3N4/MoS2/Ag3PO4　(CMA)　composite　photocatalytic　system　for　highly　improved　oxygen　evolution　from　water　splitting.　The　optimal　CAM-20　exhibits　the　fastest　oxygen-producing　rate　of　232.1　mu　mol　L-1　g(-1)　h(-1),　which　is　5　times　higher　than　that　of　bulk　Ag3PO4.　The　enhancement　in　the　photocatalytic　oxygen　evolution　can　be　ascribed　to　synergistic　effects　of　improved　visible　light　absorption,　more　efficient　separation　of　photoexcited　electron-hole　pairs　and　a　specific　charge　transfer　pathway　of　tandem　dual　direct　Z-scheme　configuration　under　light　illumination.　This　work　paves　the　way　for　the　construction　of　direct　Z-scheme　composite　photocatalytic　systems　in　water　splitting.