The invention relates to an oilseed rape transplanting method, which belongs to the field of agricultural technologies. The method comprises the following steps: after a non-woven fabric is laid at the bottom of a normalized seedling raising tray matched with a transplanting machine, spreading soil and watering, sowing a scheduled number of rape seeds, covering the seeds by using soil, and carrying out watering and fertilizing on the seeds, so that after seedlings grow to 4-5 leaf periods, normalized blanket seedlings with a root system mutually interlaced with the non-woven fabric are formed; screening seedling raising soil by using a mesh screen with a mesh side-length of 4 mm; carrying out ditching so as to form rectangular pieces of land in a field according to the integer-multiple width of the operated row number of the transplanting machine, and carrying out irrigation so as to wet the field through the rectangular pieces, wherein the tillage depth is greater than 15 cm; and taking and placing the normalized blanket seedlings into a seedling box of the transplanting machine, and driving the transplanting machine to the field to carry out a transplanting operation. According to the invention, an effect of automatic seedling supply and high-speed transplanting can be achieved, the auxiliary labor is less, the transplanting efficiency is high, and under the same conditions, the operating efficiency is 5-8 times as large as that of the existing chain-clamp type rape oilseed transplanting machine, therefore, the operation cost is greatly reduced.