The invention relates to a method for inhibiting degradation of a decarburization amine absorbent. Specifically, certain amount of antioxidant is added into the amine absorbent to inhibit degradation of the amine absorbent. The used antioxidant can be xylitol, threitol, dithiothreitol, erythritol, ethylene glycol, butanediol and other structurally similar alcohol compounds. By means of the principles of interrupting an oxidation reaction chain and decomposing an oxidative degradation product, the antioxidant can achieve significant antioxidant effects, and can be used under the circumstances of small adding amount, high temperature and wide oxygen content, thus greatly inhibiting degradation of amine water solution. Stability of a recovery solvent and continuous operation of separation equipment are ensured, the degree of corrosion caused by an absorption solvent on equipment can be reduced, and meanwhile the absorbent loss is also reduced. The method can be used for antioxidation of amine absorption solvents applied in capture and separation of carbon dioxide (CO2) from natural gas, shift gas, synthetic gas, flue gas and other industrial feed gas.