The　capture　the　low-content　NH3　from　industrial　streams,　and　recycle　it　as　the　feedstocks　for　industrial　processes　is　very　important.　In　this　work,　we　reported　the　use　of　mesoporous　polydivinylbenzene　(PDVB)　as　the　support　of　metal-based　deep　eutectic　solvents　(DESs)　containing　choline　chloride　(ChCl)　and　metal　chlorides　(SnCl2,　FeCl3　or　ZnCl2)　for　NH3　capture.　The　structure　of　composite　materials　was　characterized　in　details,　and　the　NH3　capture　performance　and　mechanism　of　them　were　also　examined　in　depth.　Owing　to　the　coordination　interaction　of　metal　ions　with　NH3,　along　with　the　hydrogen-bond　interaction　of　−　OH　and　Cl−　with　NH3,　the　DES@PDVB　composites　exhibit　considerably　high　low-content　NH3　capacities.　The　optimized　sample　ChCl　+　2ZnCl2@PDVB-1.5　can　adsorb　7.43　mol/kg　of　NH3　at　25　℃　and　0.122　bar,　which　is　advantageous　over　most　other　adsorbents　fabricated　in　the　literature.　The　mechanism　of　NH3　capture　by　DES@PDVB　composites　was　also　illustrated　through　spectroscopic　characterizations.　©　2024　Elsevier　B.V.