In　this　work,　we　fabricate　a　highly　efficient　photocatalytic　AgBr/Ag2CO3　heterojunction　through　the　co-precipitation　method.　The　obtained　samples　were　characterized　by　means　of　X-ray　diffraction,　scanning　electron　microscopy,　transmission　electron　microscopy,　ultraviolet-visible　diffuse　reflectance　spectra　and　X-ray　photoelectron　spectroscopy.　The　photocatalytic　activities　of　obtained　samples　can　be　assessed　by　visible　light　(lambda　＞=　400　nm)　degradation　of　rhodamine　B　solution.　X-ray　diffraction　revealed　that　the　crystallinity　of　the　AgBr/Ag2CO3　heterojunction　was　significantly　higher　than　pure　AgBr　and　Ag2CO3.　Moreover,　the　AgBr/Ag2CO3　heterojunction　prepared　at　pH　=　6　has　the　best　photocatalytic　performance,　it　can　raise　the　degradation　degree　of　rhodamine　B　over　95%　at　20　min.　Finally,　a　possible　photocatalytic　mechanism　is　discussed.