The present invention relates to a blood lipid-reducing composition and its preparation method, mainly characterized in that: the blood lipid-reducing composition comprises at least greasy compounds such as 1-docosene (C22H44), neophytadiene, methylabietate, and octadecane1-(ethenyloxy), etc. The compounds are obtained from the pinus morrisonicola hayata by using a supercritical extraction technique. The supercritical extraction technique includes a raw material preparation step and an extraction step, wherein the raw material preparation step is to pulverize the pine needles, and the particle size of the pulverized pine needles is less than 40 mesh, so as to increase the surface area in contact with carbon dioxide fluid to improve extraction efficiency the extraction step can be carried out in an extracting device by adopting static extraction, dynamic extraction or a combination of static and dynamic extractions.
