Method for purifying degraded amine solution

The invention relates to a method for purifying a degraded amine solution. In the method, solid purities, thermal stable salts and degraded products in an alcohol amine solution are removed by filtration, impurity removal and a strong alkali-weak alkali mixed resin purification process. Solid granules in the alcohol amine solution are removed by using a filter medium such as a molecular sieve, active carbon or an ion exchange membrane or the like; and then the filtered alcohol amine solution is subjected to ion exchange through strong alkali-weak alkali mixed resin to remove the thermal stable salts and the degraded products in the alcohol amine solution. When the pressure drop of the amine solution passing through the filter medium is over high and the airspeed is low, the filter medium is regenerated or replaced, and the regenerated resin is recycled. The method has the advantages that: the loss of the resin can be reduced by filtration and impurity removal, regeneration of the resin is favorable, and the r