The　elimination　and　recycling　of　NH3　from　the　vented　circulating　stream　of　NH3　synthesis　process　is　of　great　significance　to　the　protection　of　air　environment　and　saving　of　NH3　product.　Deep　eutectic　solvents　(DESs)　with　as　many　weak　acidic　sites　as　possible　are　anticipated　to　exhibit　high　efficiency　for　NH3　absorption　at　low　pressures.　Herein,　we　designed　and　prepared　a　series　of　metal-based　DESs　by　mixing　EaCl,　metal　chloride　(SnCl2,　ZnCl2,　FeCl3,　or　CoCl2),　and　Gly.　The　physiochemical　properties,　NH3　absorption　performance,　and　mechanism　of　prepared　metal-based　DESs　were　investigated　systematically.　It　is　found　that　considerably　high　solubilities　of　NH3　in　DESs　can　be　achieved　by　utilizing　the　multiple　coordination　and　hydrogen-bond　interaction　with　NH3　provided　by　metal　ions　and　Gly　respectively.　The　values　of　NH3　solubilities　(17.55　mol/kg　at　298.2 K　and　103.0 kPa,　and　10.24　mol/kg　at　298.2 K　and　6.8 kPa)　are　the　highest　reported　to　date.　©　2022　American　Institute　of　Chemical　Engineers.