The invention discloses a method for supercritical extraction of erucic acid. The erucic acid can be simply and quickly extracted from broccoli seeds as raw materials through drying, pulverization, sieving and supercritical CO2 fluid extraction. The method disclosed by the invention can solve the problems that most of the vegetable oils for producing erucic acid raw materials at present are obtained by a physical squeezing process and have no selectivity, and the extracted erucic acid has low purity. The method disclosed by the invention has the advantages of short time, low cost, no residualsolvent, high extraction rate, high purity and the like. The purity of the extracted erucic acid can reach 70% or higher so as to be favorable for later further purification and preparation of variousfine chemicals. Therefore, the method is suitable for industrialized extraction of the erucic acid.