The invention relates to a method for extracting saffron crocus essential oil and belongs to the field of essential oil preparation. The method for extracting the saffron crocus essential oil comprises the following steps: performing cold drying and crushing treatment on raw materials, performing steam distillation, adsorbing the obtained steam containing the saffron crocus essential oil by utilizing an adsorbent, and finally, adsorbing the adsorbent adsorbed with the saffron crocus essential oil by utilizing supercritical CO2. According to the method, a steam distillation method is combined with a supercritical extraction method, the saffron crocus oil yield can be effectively improved, and compared with a traditional steam distillation method, the method has the advantage that the oil yield is improved by about 20 percent. Meanwhile, because the supercritical extraction is only applied to an adsorption step in essential oil extraction, the process cost is reduced.