Extraction method of maca seed oil

The invention relates to the technical field of oil processing, particularly an extraction method of maca seed oil, which comprises the following steps: (1) carrying out microwave treatment on maca seeds; (2) carrying out extrusion expansion on the dried maca seeds with a single screw extruder, and recovering the oil with a pressing cage to obtain the pressed maca seed oil; (3) carrying out wet milling on the maca seed material subjected to extrusion expansion in the step (2) to obtain a mixed solution, and adding proteinase into the mixed solution to carry out enzymolysis, thereby obtaining an enzymolysis solution; and (4) carrying out enzyme deactivation treatment on the enzymolysis solution, and carrying out centrifugal separation to obtain the free maca seed oil. The water enzyme process by combining extrusion expansion pretreatment and bioenzyme is utilized to separate the maca seed oil, and has the advantages of simple equipment and high operational safety; the method can obtain the high-quality maca seed oil with high nutritive value, and can simultaneously obtain the low-denaturation high-grade maca seed protein and maca seed peptide; and the total oil extraction rate under enzymolysis process conditions can reach 92% above.