Solid-solution　materials　exhibit　promising　photocatalytic　performance　for　complete　photocatalytic　conversion　of　carbon　dioxide　(CO2)　and　water　(H2O)　into　solar　fuels　and　oxygen　(O2).　In　this　study,　Zn2SnxTi1-xO4　(0　≤　x　≤　1)　solid-solution　photocatalysts　with　an　inverse　spinel　structure　were　prepared　using　the　molten-salt-assisted　method.　The　Zn2SnxTi1-xO4　solid-solution　photocatalyst　effectively　enhanced　CO2　photoreduction　due　to　the　increase　in　optical　excitation　centers,　including　SnO4　tetrahedrons,　ZnO6,　and　TiO6　octahedrons.　Numerous　photoexcited　centers　generated　sufficient　photogenerated　carriers　to　increase　the　overall　redox　reaction　rate　of　H2O　and　CO2.　In　situ　Fourier　transform　infrared　spectroscopy　analysis　revealed　that　the　distortion　of　the　structural　unit　of　the　Zn2SnxTi1-xO4　solid　solution　not　only　improved　the　separation　of　photogenerated　charges　but　also　promoted　the　activation　of　CO2　molecules　on　the　catalyst　surface.　Moreover,　the　reduction　in　the　effective　mass　of　photogenerated　carriers　in　the　Zn2SnxTi1-xO4　solid　solution　enables　their　fast　migration,　which　results　in　excellent　carrier　movement.　This　synergistic　effect　leads　to　enhanced　photoactivity　of　Zn2SnxTi1-xO4　for　CO2　reduction.　©　2022　American　Chemical　Society.