Sweet potato leaves are tender leaves at the top or both sides of the stem of sweet potato seedlings. In the south, sweet potatoes can be harvested all year round. Compared with other common vegetables, the contents of minerals and vitamins in sweet potato leaves are superior. Every 100 grams of fresh sweet potato leaves contains 2.28g of protein, 0.2g of fat, 4. 1 g of sugar, 2.3mg of mineral potassium10.6mg of iron, 34mg of phosphorus, 6.42mg of carotene and 0.32mg of vitamin C. The content of carrots is even three times higher than that of carrots. Eating bright green sweet potato leaves often can meet the needs of vitamins A, C, E and iron supplementation.

Sweet potato leaves are rich in mucin, which has health care functions such as improving immunity, stopping bleeding, lowering blood sugar, detoxicating, preventing night blindness and promoting metabolism in new town. In addition, regular consumption of sweet potato leaves can effectively prevent constipation, protect eyesight, keep skin delicate and delay aging. According to the classic literature of Chinese medicine, sweet potato "tonifies deficiency and benefits qi, strengthens spleen and stomach, and strengthens kidney yin". Therefore, sweet potato leaves are also called "vegetable queen", "longevity vegetable" and "anticancer vegetable".