Phosgene　is　a　suffocating　toxic　gas　that　seriously　threatens　human　health　and　public　security.　In　this　work,　we　devised　a　colorimetric　and　fluorogenic　chemosensor　(BDY)　for　phosgene　by　using　3,5-dimethyl　BODIPY　as　a　fluorescent　reporter　and　o-phenylenediamine　as　the　recognition　site.　The　BDY　sensor　displayed　an　obvious　color　change　from　yellow　to　pink　in　conjugation　with　a　fluorescence　turn-on　response　due　to　nucleophilic　substitution　and　cyclization　reactions　with　phosgene.　BDY　could　detect　phosgene　with　a　rapid　response　(9　s),　low　detection　limit　(14　nM),　and　outstanding　selectivity.　Moreover,　BDY-loaded　test　strips　were　prepared　to　serve　as　portable　and　sensitive　kits　for　real-time　visual　monitoring　phosgene　with　good　performance.