High-yield cultivation method for potatoes with three layers of potatoes

The invention relates to a high-yield cultivation method for potatoes with three layers of potatoes, which adopts large ridges 75-90 cm long, and applies high-quality high-yield virus-free potato seeds and a special fertilizer for potatoes. In sowing, 20-30 cm deep ditching is conducted, and 10-12 cm first earthing is conducted after the sowing. When seedlings grow up to 10 cm, the seedlings are broken at a position 5-7 cm on potato tubers of the potato seeds and the broken seedlings are leveled together with soil by using a special seedling breaking device and a leveler. When the seedlings come up out of the ground and grow up to 3-5 cm, a special hiller is used for earthing up for 10-12 cm, so as to tightly seal and cover all the seedlings coming up out of the ground. By adopting the deep ditching, and one-time earthing up, one-time sealing breaking and one-time seedling sealing after the sowing, so that new potato points of the potatoes are formed, and a three-dimensional structure with three layers of pot