The　efficient　separation　and　collection　of　ammonia　(NH3)　during　NH3　synthesis　process　is　essential　to　improve　the　economic　efficiency　and　protect　the　environment.　In　this　work,　ethanolammonium　hydrochloride　(EtOHACl)　and　phenol　(PhOH)　were　used　to　prepare　a　novel　class　of　deep　eutectic　solvents　(DESs)　with　multiple　active　sites　and　low　viscosities.　The　NH3　separation　performance　of　EtOHACl　+　PhOH　DESs　was　analyzed　completely.　It　is　figured　out　that　the　NH3　absorption　rates　in　EtOHACl　+　PhOH　DESs　are　very　fast.　The　NH3　absorption　capacities　are　very　high　and　reach　up　to　5.52　and　10.74　mol·kg−1　at　11.2　and　100.4　kPa　under　298.2　K,　respectively.　In　addition,　the　EtOHACl　+　PhOH　DESs　present　highly　selective　absorption　of　NH3　over　N2　and　H2　and　good　regenerative　properties　after　seven　cycles　of　absorption/desorption.　The　intrinsic　separation　mechanism　of　NH3　by　EtOHACl　+　PhOH　DESs　was　further　revealed　by　spectroscopic　analysis　and　quantum　chemistry　calculations.　©　2023　The　Chemical　Industry　and　Engineering　Society　of　China,　and　Chemical　Industry　Press　Co.,　Ltd