The invention discloses a sweet potato fruit with a lactic acid hawthorn flavor. The sweet potato fruit is prepared from the following raw materials in parts by weight: 370-380 parts of sweet potatoes, 105-110 parts of lotus root starch, 40-45 parts of cashew kernels, 50-60 parts of hawthorn fruit powder, 15-18 parts of tremella, 6-8 parts of peanut seed coat, 20-25 parts of lonicera caerulea, 25-30 parts of fish roes, 45-50 parts of yoghourt, 18-20 parts of cocoa liquor, 3.4-3.6 parts of dendrobium officinale, 2.8-3 parts of fructus gardeniae, 2.8-3 parts of gynostemma pentaphyllum, 40-45 parts of white sugar and a proper amount of oil and water. The sweet potato fruit is prepared from the lotus root starch, the hawthorn fruit powder, the fish roes, the yoghourt and the cocoa liquor, has a lactic acid flavor when eaten, and is sweet and appetizing; the contained raw materials are reasonably matched and processed, so that the sweet potato fruit disclosed by the invention is abundant and balanced in nutrient, and has good effect after being taken for a long time; and in addition, the Chinese herbal medicines, such as dendrobium officinale and gynostemma pentaphyllum, are also added, so that the sweet potato fruit disclosed by the invention has a certain health preservation effect and is suitable for most people.