The present invention is a sweet potato seed preparation step of preparing a sweet potato seedling obtained by cutting a first node from the root of a sweet potato seedling having a length greater than or equal to 25 cm and less than or equal to 45 cm in a green house at an angle of 45 degrees; An immersion step of immersing the stem portion of the sweet potato seedling in water at 21° C. for 36 hours; A first herbicidal step of spraying a herbicide 10 to 12 days before planting the sweet potato seedlings in the soil for planting the sweet potato seedlings immersed in the water; A complex fertilizer supply step of supplying 250 to 350 kg of a complex fertilizer with a weight ratio of 150:80:80 per 1 ha of nitrogen:phosphorus:potassium to the soil to plant the sweet potato seedlings immersed in the water; A duduk forming step of forming a duduk having a depth of 50 to 70 cm and a height of 50 to 60 cm in the soil to plant the sweet potato seedlings immersed in the water; A mulching step of installing a drip tape capable of supplying water or nutrients on the top of the duke, mulching the two adjacent duke and the middle furrow of the duke with vinyl, and punching a hole for planting sweet potato seeds in the mulched vinyl; A formal step of planting a sweet potato seedling by inserting from the third to the fifth stem of the sweet potato seedling immersed in water into the hole; A second herbicidal step of spraying a herbicide after planting the sweet potato seedlings; And a mixed fertilizer obtained by mixing 70 to 150 kg of a complex fertilizer having a weight ratio of 150 to 250 kg of ammonium nitrate and nitrogen: phosphorus: potassium per ha of 150: 80: 80 per ha in the soil where the sweet potato seedlings are planted. It relates to a method of cultivating sweet potatoes in sandy soil comprising a; mixed fertilizer supply step of feeding times to six times.
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