The invention discloses a sweet potato slice. The sweet potato slice is prepared by peeling off a raw material, slicing, blanching, frying and degreasing. The sweet potato slice consists of 20-30kg of sweet potatoes, 8-10kg of maltose, 10-20g of vitamin B6, 1-3kg of citric acid and 2-3kg of edible oil. The sweet potato slice is abundant in nutrition, and spicy and crisp in taste. Meanwhile, the sweet potato slice has healthcare functions of reducing blood sugar, improving blood circulation, adjusting immune and the like. The sweet potato, which is rich in starch, dietary fiber, carotene, vitamins A. B, C and E as well as more than 10 kinds of trace elements including potassium, iron, copper, selenium, calcium and the like, linoleic acid and the like, is relatively high in nutritive value, and is regarded as a healthcare food with the most balanced nutrition by nutritionists. The materials can keep blood vessel elasticity, and can effectively prevent and treat the senile habitual constipation.