The invention relates to the technical field of food processing, and concretely relates to a processing method for coproducing a sweet potato juice, starch and total-sweet potato starch by using sweet potato. The method adopting sweet potato as a raw material comprises the following steps: dicing the peeled raw material, crushing the diced raw material, juicing the crushed raw material, dehydrating the juiced raw material, carrying out low temperature drying on the obtained solid phase material to obtain powder, crushing the powder, and screening the crushed powder to obtain screen underflow which is the total-sweet potato starch; and allowing the above obtained liquid part to enter a fresh fruit and vegetable normal juice processing device, processing the liquid part, and separating the processed liquid part to obtain free starch and an NFC sweet potato juice. The method avoids cooking the raw material through blanching, microwave and pre-boiling, guarantees that the product is the sweet potato starch, and reduces loss of nutrients.