A method for producing clear, concentrated sweet potato juice, including: a) cleaning, peeling, crushing, and gelatinizing a raw material of sweet potatoes to yield a sweet potato paste, and squeezing the sweet potato paste to obtain skin dregs and a squeezed clear juice； b) performing enzymolysis to part of the skin dregs and adding the hydrolyzed skin dregs to the sweet potato paste for squeezing； c) performing enzymolysis and filtering to the squeezed clear juice to obtain a sweet potato clear juice； d) combining the rest part of the skin dregs and sweet potato skins generated during the peeling process to obtain a sweet potato residue； e) extracting dietary fiber from the sweet potato residue； and f) adding the dietary fiber to the sweet potato clear juice and post-treating the sweet potato clear juice.
