Eutrophication-induced　algal　blooms　present　serious　risks　to　aquatic　ecosystems　and　human　health　by　crowding　out　the　living　space　of　aquatic　plants　and　animals.　In　this　study,　an　Ag2CO3/WO3　photocatalyst　with　exceptional　optical　properties　was　synthesized　using　an　in　situ　stirring　method.　This　photocatalyst　exhibited　remarkable　efficacy　in　the　visible　light　photocatalytic　inactivation　of　Microcystis　aeruginosa,　achieving　nearly　100%　algal　removal　within　180　min.　To　elucidate　the　particular　effect　on　algae　cell　for　visible　light　photocatalytic　inactivation,　the　physiological　changes　in　algal　cells　were　further　investigated.　Our　findings　revealed　that　Ag2CO3/WO3　severely　impairs　membrane　permeability,　disrupts　stability,　and　interferes　with　the　physiological　metabolism　of　algal　cells,　leading　to　the　continuous　release　and　subsequent　degradation　of　intra-　and　extracellular　organic　matter.　Additionally,　several　reactive　radicals,　·OH,　·O2−,　1O2　and　h+,　are　considered　the　primary　contributors　to　the　inactivation　of　algal　cells　during　visible-light　photocatalytic　inactivation.　And　efficient　electron-hole　separation　in　Ag2CO3/WO3,　induced　by　the　internal　electric　field,　is　a　prerequisite　for　reactive　oxygen　species　(ROSs)　generation.　Based　on　these　findings,　a　potential　mechanism　for　the　visible　light　photocatalytic　inactivation　of　M.　aeruginosa　by　Ag2CO3/WO3　was　proposed.　Overall,　Ag2CO3/WO3　demonstrated　exceptional　effectiveness　in　removing　M.　aeruginosa　and　held　promise　for　application　in　managing　harmful　cyanobacteria　blooms　in　aquatic　ecosystems.　©　2025　Elsevier　B.V.