The invention relates to a method for preparing beverage, fruit wine and fruit vinegar by using black potato containing anthocyanin. The method comprises the steps of: juicing black potato used as raw material, adding an antioxidant, roughly filtering, precipitating, taking supernatant, flocculating, settling, finely filtering, and carrying out ultrafiltration to obtain black potato original juice; or carrying out concentrating, blending and sterilizing and the like to obtain beverage or concentrated beverage; the black potato fruit wine is prepared by the steps of fermenting, filtering, storing and ageing, blending, sterilizing and filling; black potato fruit vinegar is prepared by adding acetobacter and fermenting again on the basis of the preparation steps of the black potato wine. The black potato beverage, fruit wine and fruit vinegar can be directly eaten, and also can be mixed with other ingredients which are both medicine and food to be prepared into functional composite beverage; and the composite beverage not only contains protein, amine acid, vitamins, anthocyanin, various minerals and trace elements which are also contained in single beverage, but also has the effects brought by composite ingredients, and is functional beverage which can improve immunity and resist cancers, oxidation, depression and ageing.