Crystal　facet　regulation　is　an　effective　method　for　preparing　SrTiO3　or　other　perovskite　semiconductor　materials　with　high　photochemical　catalysis　performance.　In　general,　the　edge-truncated　cube　of　SrTiO3　micro-nano　particles　has　been　widely　reported　because　of　the　multiple　crystal　facets　exposed　at　the　same　time.　However,　the　effect　of　the　(110)　facet　and　the　interaction　between　the　(100)　and　(110)　facets　on　the　properties　of　photo-induced　carriers　is　still　not　very　clear.　In　this　article,　we　have　designed　and　prepared　two　edge-truncated　cube　SrTiO3-a　small　and　large　area　proportion　of　the　(110)　facet,　respectively.　In　addition　to　the　morphological　and　structural　characterization,　high-resolution　XPS　and　femtosecond　multiphoton　transient　absorption　(fs-TA)　spectroscopy　were　used　to　detect　the　atomic　vacancy　and　were　applied　to　confirm　the　state　of　carrier　transition.　The　results　showed　that　the　larger　(110)　facet　led　to　two　influences-more　Sr　vacancies　and　more　self-trapping　excitons　(STEs)　with　an　ultra-low　binding　energy　(E-b　=　2.13　meV),　about　1.17　meV　lower　than　that　of　the　sample　with　the　smaller　(110)　facet.　In　particular,　the　larger　(110)　facet　also　caused　a　much　higher　photooxidation　performance　for　Co2+　to　Co3+.　This　study　not　only　enriches　the　arsenal　of　SrTiO3　materials　but　also　sheds　new　insights　into　the　understanding　of　the　synergistic　effect　essence　of　the　(100)　and　(110)　facets,　which　could　promote　the　development　of　new　perovskite　photocatalytic　materials,　particularly　in　the　recovery　of　heavy　metals.