The　conversion　of　CO2　to　valuable　chemicals　by　photocatalysis　has　attracted　widespread　interesting.　Owing　to　the　linear　structure　of　CO2　molecule　with　strong　C--O　bond,　the　surface　reaction　is　considered　as　one　of　the　main　issues　to　restrict　the　conversion　efficiency.　Herein,　soluble　UiO-66　has　been　developed　as　co-catalyst　to　enhance　the　photocatalytic　performance　for　CO2　reduction.　The　soluble　UiO-66　has　presented　the　performance　ca.　1.5　higher　than　the　insoluble　version,　yielding　30.6　mu　mol/h　for　CO2　to　CO　conversion　by　using　5.0　mg　sample.　This　improvement　can　be　attributed　to　the　preserved　framework　by　soluble　UiO-66.　Therefore,　the　chemisorption　of　CO2　molecules　can　be　improved,　boosting　the　reduction　reaction　for　CO　production.　This　research　provides　a　new　path　for　a　rational　design　of　metal-organic　framework　(MOF)　for　photoredox　catalysis,　meanwhile　inspiring　advanced　application　of　MOF　catalysis　with　the　soluble　manner.