The invention relates to a rape potted-seedling cultivation method. The method adopts the technical scheme comprising the following steps: taking a hard rice pot tray, taking a standard rice seedling raising medium as seedbed soil, filling the seedbed soil in the pot tray, watering, drying rape seeds in the sun, dressing the seeds with uniconazole, covering the pot tray with straw mulch to keep out light, watering before and after seedling emergence, and transplanting seedlings at a stage of 4-5 leaves. The method overcomes defects in cultivation of rape seedlings suitable for mechanical transplanting under the conditions of narrow and small space and high density. Through a precise and quantificational fixed-position rape-planting method provided by the invention, the quantity of seedlings in each hole can be controlled precisely when rape potted-seedlings are planted, and when the seedlings are transplanted, one seedling is planted in each hole and the quantity of seedlings planted in each hole can also be controlled precisely, so that the construction of quality of a high-yield group is facilitated; during transplanting, the soil blocks of the each hole are mutually independent so as not damage roots, and meanwhile, the seedlings carry a great amount of soil, and the soil blocks are not broken, so that a recovery period after transplanting is saved, and the seedlings grow quickly; the cultivation of rape potted-seedlings succeeds, and the advantage of high yield is obvious.