Novel high-efficient compound decarbonization solvent

The invention discloses a novel high-efficient compound decarbonization solvent which comprises N-methyldiethanolamine and an active agent. The active agent is a mixture which consists of at least two of N-hydroxyethyl morpholine, 2-amino-2-methyl-1-propanol and piperazine, wherein the weight ratio of the N-hydroxyethyl morpholine is 80 to 90 percent; the weight ratio of the active agent is 10 to 20 percent and a defoaming agent is also added into the compound decarbonization solvent. The novel high-efficient compound decarbonization solvent has the advantages of high carbon dioxide absorption capacity, high purification degree, low regeneration energy consumption, and no foams after long-term use of the decarbonization solvent.