Preparation process of pure natural sweet potato beverage in original color and taste

The invention discloses a pure natural sweet potato beverage in original color and taste, which belongs to the field of food production process. The beverage is made from purple sweet potatoes as raw material, the process includes enzymolyzing purple sweet potato residue, preserving nutrients and color, flavoring, executing non-thermal sterilization treatment with a rare earth ultrasonic transducer, and packaging. According to the invention, the natural purple potato and the baking purple potato are used for providing natural flavor of the beverage, amylases and pectase are used to digest starch to provide a part of the sweet taste, and a large amount of nutrients such as antioxidants, multiple amino-acids or the like are preserved by maximum in the whole treatment process. The sweet red wine has bright color, fragrance special for purple sweet potato, slightly sweet taste, pure mouth feeling, long aftertaste, without sediment or cloudiness, which is suitable for long-term storage, and convenient for taking. The wine has functions of blood circulation promotion, fatigue recovering, obesity prevention and treatment, gastrointestinal function improvement, skin moistening or the like, is capable of suppressing generation of lipid peroxide, preventing human body aging, and has relative great cancer prevention effect.