The present invention provides a layered absorbent for trapping CO2 in tail gas. The absorbent comprises a basic absorbent, an activation agent, a boiling point increasing agent, water and an organic solvent; the basic absorbent is selected from one or more of N,N-dimethylethanolamine, N,N- diethyl ethylene diamine, N,N-dimethyl cyclohexyl amine, N-methyldiethanolamine, 1,4-diaminobutane, 1,5-diaminopentane, bis(2-ethylhexyl)amine, octodrine, di-n-propylamine, tripropylamine and paranitroaniline; the activation agent is selected from one or more of diisopropanolamine, diethanol amine, diglycolamine, triethylene glycol amine, and morpholine; the boiling point increasing agent is selected from one or more of dimethylformamide, dimethylacetamide, ethylene glycol monomethyl ether, and oxalic acid; and the organic solvent is selected from one or more of methanol, ethanol, benzyl alcohol, phenylethanol, n-propyl alcohol, and isopropyl acetate. The layered absorbent for trapping CO2 in the tail gas is high in absorbing ability, fast in absorption rate, low in regeneration temperature, and low in regeneration energy consumption.