The　conversion　of　CO2　into　clean　hydrocarbon　fuels　by　photocatalytic　technology　has　been　recognized　as　a　promising　strategy　to　solve　environment　and　energy　crisis.　La2Sn2O7　modified　with　CuxO　(CuxO/La2Sn2O7)　are　synthesized　via　a　two-step　hydrothermal　route　and　applied　to　the　photocatalytic　CO2　reduction　without　sacrificial　reagents.　The　optimized　2.4%　CuxO/La2Sn2O7　composite　shows　excellent　CO2　reduction　activity　with　CH4,　CO　and　H2　yields　of　7.6,　109.4　and　185.6　μmol·g−1　under　3　h　illumination,　respectively.　The　total　utilized　photoelectron　number　(UPN)　reaches　650.8　μmol·g−1,　which　is　approximately　6　and　3　times　higher　than　those　of　referenced　La2Sn2O7　and　Au/La2Sn2O7.　The　enhanced　photocatalytic　performance　is　attributed　to　the　formation　of　the　CuO/Cu2O/Cu　clusters,　evidenced　by　the　Auger　spectra　and　HRTEM,　leading　to　an　efficient　spatial　separation　of　photoinduced　charges.　This　work　sheds　light　on　the　design　and　construction　of　high-performance　CuxO　modified　photocatalyst　for　the　light-to-energy　application.　©　2021　Elsevier　B.V.