The invention discloses a cultivation method for reducing the production risk of winter green manure of a rice field. The cultivation method comprises the following operation steps of 1, according tohistorical data of local long-term climate, calculating climate risks of green manure sowing and germination and later vegetative growth of the winter green manure in different stages, and selecting the proper winter green manure sowing date; 2, according to the field coverage biomass of previous rice straw, selecting different straw treatment methods, winter green manure sowing methods and sowingamounts; 3, after the winter green manure is sowed, 4-6 kg of potassium chloride and 0.5 kg of zinc sulfate are uniformly spread per mu; 4, transverse furrows with the spacing of 200-250 cm are dug in field parcels, wherein the transverse furrows are 20 cm in width and 10-15 cm in depth, and the soil covering thickness of a ridge face between every two adjacent transverse furrows is 1.3-1.6 cm. According to the cultivation method, the cultivating risk of the winter green manure is lowered, the yield of the green manure of multiple years is increased, the yield stability is improved, the effects of the winter green manure on improving soil fertility, replacing chemical fertilizer and improving the environment can be better achieved, and the yield of later rice is increased.