The invention discloses a method for intercropping winter rapes and potatoes on middle-season rice crop. The method for intercropping the winter rapes and the potatoes on the middle-season rice crop comprises the steps of (A) preparing rest-balks, wherein the width of the faces of the rest-balks is 120cm, and the width of the furrows of the rest-balks is 40cm; (B) applying base fertilizer, wherein the base fertilizer for the rapes and the base fertilizer for the potatoes are simultaneously scattered and applied to the floor field of the faces of the rest-balks; (C) sowing seeds, the rapes are sowed in line on the upturned soil close to the edges of the rest-balks, the sowing width is within 10cm, ten thousands rapes per mu are reserved, the potatoes are arranged and sowed in the rest-balks, the planting distance is 22cm, and 1894 holes of the potatoes are planted per mu; (D) carrying out straw covering, wherein the seed potatoes are covered by straw for 6-7cm, and the parts of the sowing width of the rapes are not covered by the straw; (E) carrying out deep furrow hoeing, wherein the furrows of the rest-balks are hoed deep to 25cm under the field surface, and soil blocks are evenly moved and placed to the parts without the rapes or the potatoes; (F) carrying out soil covering, wherein if the weather is sunny after the seed sowing of the rapes, around 2cm crumbing soil covers the ports of the sowing width; (G) carrying out hilling, wherein after the seedlings of the potatoes are all emerged, the furrows of the rest-balks are cleaned, and the soil is beaten to carry out the hilling; (H) harvesting the potatoes, wherein the straw in the rest-balks is pushed aside, and the potatoes are harvested; (I) carrying out management, wherein the technologies of good seed application and promotion, potato accelerating germination sowing and the like are applied and popularized, and daily field management needs to be carried out well.