The invention discloses a method for extracting angelica oil. The method is mainly characterized by comprising the following steps of: (1) firstly screening the angelica
raw material, cleaning and
drying until the
water content is less than or equal to 13%, and
grinding to 40-60 meshes by a grinder; (2) putting the dried and ground angelica into an extraction kettle, vacuumizing until the pressure is below 1*10<4>Pa, and exhausting the air in the extraction kettle; (3) leading a tetrafluoroethane solution into the extraction kettle by a
plunger pump until the angelica
raw material is submerged by the liquid level according to the observation through a
sight glass; (4) heating and stirring, and starting extraction, wherein the extraction pressure is 0.8-1.5MPa, the extraction temperature is 35-40 DEGE C, each extraction process lasts for 45min, and the extraction is performed twice; (5) performing reduced-pressure heating
evaporation and separation in a separation kettle, heating and keeping the separation temperature at 45-50 DEG C, and pumping the negative pressure by a
diaphragm compressor to gradually reduce the pressure to 5*10<-2>Pa, wherein each
separation process lasts for 30min, and the separation is performed twice; and (6) after the subcritical extraction is over, merging the angelica oil obtained by the extraction twice, performing
centrifugal separation by a high-speed
centrifuge, and filtering to obtain the final angelica oil product. According to experimental
verification, the final yield of the angelica oil under the technological conditions is 2.0%, the content of ligustilide is 62.16%, and the appearance quality of the product is good.