The invention relates to a method for cultivating winter-planting potatoes. The method comprises the steps of soil preparing, ridging, base fertilizer applying, potato processing, seeding, soil covering, straw or dry weed covering, soil covering on straws or dry weeds for the second time, water and fertilizer applying, plant disease and insect pest managing and harvesting. According to the method, on the basis of a traditional bare land cultivating mode, the method of straw or dry weed covering and fine crushing soil layer covering on the surfaces of the straws or dry weeds is adopted, water in soil in the cultivating layer is effectively prevented from being conveyed to the bed surface, water evaporation of the soil in the cultivating layer is reduced, the fertilizer and water circumstance of the soil is improved, and the effects of early emergence and the high emergence rate are achieved. The surfaces of the straws or dry weeds are covered with a soil layer so that the straws or dry weeds can be pressed and protected against wind blowing, fine crushing soil becomes dry soil easily on the surfaces of the straws or dry weeds, the effect of restraining growth of the straws or dry weeds on the bed surface is achieved, intertillage and weeding are not needed during the growth period, field management labor intensity and costs can be reduced, the additives are the straws or dry weeds and can return to the field after rotting, the amount of organic matter of the soil is increased, environmental friendliness is achieved, and no pollution is caused. According to the method, the rate of survival of seedlings is improved by 8.74%, the growth period is shortened by 11 days, and the number of commodity potatoes is increased by more than 10%.