NOVELTY - Method for cultivating and improving yield of organic sweet potato, involves (a) selecting land, (b) selecting variety of organic sweet potato plants, (c) immersing organic sweet potato slips in traditional Chinese medicinal composition, planting the organic sweet potato slips in the seedling bed, and covering the seedling bed using mulch film, (d) applying diluted lipid components and decomposed organic fertilizer to the land, and planting organic sweet potato seedlings in the land, (e) performing field management, and (f) harvesting the organic sweet potato.    USE - The method is useful for cultivating and improving yield of organic sweet potato (claimed).    ADVANTAGE - The method improves yield of organic sweet potatoes having high quality, causes no pollution as it avoids usage of chemical pesticide and chemical fertilizers, and provides nutritional components required for growth of organic sweet potato seedlings.    DETAILED DESCRIPTION - Method for cultivating and improving yield of organic sweet potato, involves (a) selecting flat land having loose and fertile soil, digging seedling bed in the soil, and mulching the seedling bed, drying the seedling bed for 2-3 days, and filling the seedling bed with 5-10 kg/m2 decomposed organic fertilizer, where the seedling bed has length of 600-650 cm, width of 125 cm and depth of 15-20 cm, (b) selecting variety of organic sweet potato plants having bright color, where selected organic sweet potato plants are not affected with diseases, (c) immersing organic sweet potato slips in traditional Chinese medicinal composition at 50-55 degrees C for 10-20 minutes under stirring condition, planting the organic sweet potato slips in the seedling bed, and covering the seedling bed using mulch film, (d) digging channel for drainage in the soil, uniformly spraying 600-800 times diluted lipid components to the land, applying 500-800 kg decomposed organic fertilizer/acre land, providing ridges having bottom width of 105-110 cm, height of 35-40 cm, width of 45-50 cm and depth of 17-22 cm in the land, planting obtained organic sweet potato seedlings in the land, and providing plant spacing of 35-40 cm and row spacing of 60 cm in the land, where 2 seedlings are planted/hole of the land, (e) performing field management by applying insecticide to the seedlings for killing insects, and promoting stem expansion of the seedlings, and (f) timely harvesting the organic sweet potato.