Nylon 56 salt continuous crystallization refining method

The invention relates to a continuous crystallization refining method of nylon 56 salt. The continuous crystallization refining method comprises the following steps: carrying out reduced pressure distillation dehydration on a low-concentration nylon 56 salt solution, carrying out cooling crystallization, carrying out centrifugal separation, carrying out reduced pressure distillation dehydration on centrifugal mother liquor, carrying out cooling alcohol precipitation, carrying out centrifugal separation, and collecting nylon 56 salt crystals. According to the method, a cooling crystallization and cooling alcohol precipitation crystallization coupling technology is adopted, no mother liquor is recycled, the refining cost is reduced, no impurity is enriched, the quality of the nylon 56 salt crystal product is improved, and continuous production of crystallization and refining of the nylon 56 salt is realized.