Method for preparing dietary fiber by extracting potato residues

The invention discloses a method for preparing dietary fiber by extracting potato residues, belongs to the field of food additives and solves the problems of difficult utilization and environmental pollution of fresh potato residues. Small potato blocks in the potato residues are grinded and crushed by using composite biological engineering technology, so that the potato fiber can be separated from other ingredients; protein and starch are removed by enzyme hydrolysis; pectin is dissolved out by acid hydrolysis; the potato pectin can be extracted by using liquid obtained by solid-liquid separation; and the potato dietary fiber can be extracted from the solid matters. In the method of the invention, the potato dietary fiber is extracted from the potato residues, so that the potato residues can be utilized and the environmental pollution can be reduced. The dietary fiber prepared by using the method has the functions of high water holding capacity, high expansibility, high physiological activity and the like, a