Antimony　sulfide　is　a　promising　wide　bandgap　light-harvesting　material　owing　to　its　high　absorption　coefficient,　nontoxicity,　superior　stability,　and　low　cost.　However,　the　reported　Sb2S3　absorber　suffers　from　complicated　defect　characteristics　due　to　its　quasi-1D　structure.　Herein,　a　codoping　technique　from　chlorine　and　selenium　is　developed　in　hydrothermal　method　to　regulate　the　film　defect　properties　and　promote　the　device　efficiency.　The　theoretical　calculation　and　experimental　results　demonstrate　that　the　Cl&Se　codoping　plays　a　synergistic　role　in　absorber　film　quality　improvement.　Se　doping　could　efficiently　fill　the　intrinsic　deep　defect　level　V-S　and　Cl　is　a　benign　n-type　dopant　and　favor　[hk1]　oriented　deposition.　Systematic　device　physical　characterizations　verify　the　codoped　device　superior　heterojunction　quality　and　much　lower　interface　and　bulk　defect　density　comparing　with　control　one.　The　optimal　codoping　device　delivers　a　certified　power　conversion　efficiency　of　7.15%　(5.9%　for　control　one),　the　highest　certified　value　in　planar　Sb2S3　solar　cells.　This　study　develops　an　effective　doping　strategy　with　multi-element　synergistic　incorporation　which　sheds　new　light　on　high-efficiency　Sb2S3　solar　cells.