The invention is a method for extracting safflower seed oil by supercritical CO2, putting 0.3-0.5mm-sized crushed safflower seeds in the extracting cylinder of a supercritical extractor, and using supercritical CO2 as extractant to make extraction at 20-28MPa and 35-60DEG C; separating after extraction, where primary separation pressure and temperature are 9-14MPa and 35-50DEG C, respectively, and the corresponding product is safflower seed oil; secondary separation pressure and temperature are 5-8MPa and 30-40DEG C, respectively, and the corresponding products are water and safflower seed oil. And it has high extracting speed, the safflower seed oil product has no extractant remaining and has high purity, and the unsaturated fatty acid content can reach above 90%, where the linoleic acid content is about 85%.