Efficiently　separating　NH3　from　the　exit　gas　of　NH3　synthesis　tower　has　significant　economic　and　environmental　benefits,　such　as　improving　the　NH3　conversion　rate　and　reducing　pollution　emission.　In　this　study,　a　series　of　EtOHACl　+　Gly　deep　eutectic　solvents　(DESs)　with　numerous　hydrogen-bond　sites　were　synthesized.　The　findings　suggest　that　the　use　of　EtOHACl　+　Gly　DESs　can　result　in　both　exceptional　NH3　absorption　capacities　and　superior　selectivities.　EtOHACl　+　Gly　(1:2)　has　the　NH3　capacities　of　up　to　12.39　mol/kg　at　298.2　K　and　105.5　kPa,　while　its　N2　and　H2　capacities　are　negligible.　Additionally,　the　absorbed　NH3　can　be　easily　released　by　heating　and　reducing　pressure,　and　the　NH3　capacities　remain　stable　after　undergoing　six　cycles.　The　study　also　examined　the　interaction　mechanism　of　EtOHACl　+　Gly　DESs　for　the　NH3　separation,　utilizing　spectral　characterizations,　quantum　chemistry　calculations　and　molecular　dynamics　simulations.　©　2023　Elsevier　B.V.