The invention mainly discloses a method for improving amino functional carbon capture through spatial synergistic effect.With functionalized ion liquid, which can form amino anions of a dihydrogen bond structure in molecules, being absorbent, carbon dioxide is absorbed, wherein absorbing pressure is 0.0001-0.2 MPa, absorbing temperature is 20-100 DEG C, absorbing time is 01-3 hours, absorbed carbon dioxide is quite easy to desorb, desorption temperature is 60-120 DEG C, and desorption time is 0.1-3 hours.Compared with a traditional amino functional capturing agent, through designing amino functionalized ion liquid of different spatial structures, through intramolecular hydrogen bond action between anions and formed carbamic acid, monomolecular amino and dimolecular carbon dioxide can act, in this way, the using efficiency of amino is greatly improved, and 1.43 moles of carbon dioxide can be captured to the maximum per mole of amino.