The invention relates to natural fermented fruit juice. The natural fermented fruit juice is composed of raspberries, blueberries, pineapples, pawpaws, sea buckthorns and mulberries according to the mass proportion of 3:3:3:3:4:4. A method for making the natural fermented fruit juice comprises the following steps of: selecting high-quality raw materials, washing clean, stirring, crushing, fermenting filtering, split charging, sterilizing, externally packaging, testing quality, and warehousing a finished product, wherein residues are reused as organic fertilizers. A closed type fermentation tank is used in the invention; the fact that the fruit juice fermentation process is completed in a closed space is completely ensured; other substances are prevented from being mixed; therefore, the quality is ensured; simultaneously, by adopting natural fermentation, the components in fruit juice, such as enzymes, vitamins and dietary fibre, are retained to the greatest extent; furthermore, after being fermented, nutritional components are absorbed by human bodies more easily; and in addition, because additives, such as any preservative, are not added in the production process of the natural fermented fruit juice, the original pure natural effect is ensured.