It　remains　a　challenge　to　search　for　semiconductor　photocatalysts　for　the　overall　conversion　of　carbon　dioxide　(CO2)　with　H2O　to　hydrocarbons.　Herein,　two-dimensional　(2D)　WO3　nanosheets　were　loaded　on　2D　LaTiO2N　microplates　to　construct　a　direct　Z-scheme　photocatalytic　system　to　realize　the　overall　conversion　of　gas-phase　CO2　and　H2O　without　any　noble　metal　cocatalysts　or　sacrificial　reagents　under　visible　light.　The　optimal　performance　has　been　achieved　by　a　WO3/LaTiO2N　composite,　and　the　yields　of　CO　and　CH4　of　2.21　and　0.36　mu　mol　g(-1)　h(-1)　are　obtained　by　reducing　CO2,　respectively.　The　total　utilized　photoelectron　number　(UPN)　has　reached　7.3　mu　mol　g(-1)　h(-1),　which　is　approximately　4.3　and　8.7　times　higher　than　that　of　the　pristine　LaTiO2N　and　WO3,　respectively.　The　improved　photocatalytic　activity　for　CO2　reduction　can　be　due　to　the　promoted　charge　separation　by　the　formation　of　a　Z-scheme　heterojunction　between　LaTiO2N　and　WO3.　Moreover,　the　short　charge　transfer　distance　and　large　contact　interface　between　2D　WO3　and　2D　LaTiO2N　further　accelerate　the　transfer　of　photogenerated　carriers.　This　study　is　anticipated　to　develop　novel　perspectives　for　the　reasonable　development　and　preparation　of　high-efficient　2D/2D　Z-scheme　photocatalysts　for　CO2　reduction.