Sweet potato aerial cultivation method

The invention relates to the technical field of sweet potato cultivation, and discloses a sweet potato aerial cultivation method which comprises the following steps: making nutrition boxes, and uniformly placing the nutrition boxes at intervals; nutrient soil is prepared, fermented cow dung, overwintering weathered fertile mellow soil and potassium sulfate balanced compound fertilizer are evenly mixed and put into a nutrient box; potato seedlings are planted, detoxified healthy potato seedlings are selected, and only two potato seedlings are planted in each box; performing drip irrigation watering according to the frequency of watering once every three days and applying a nutrient solution once every ten days; potato roots are removed, potato branches are removed, the roots which are expanded and prone to forming potato blocks are removed, and branches are removed; transplanting the sweet potato seedlings into flowerpots in a greenhouse, and pressing sweet potato vines when the sweet potato vines grow to 25 c