Supercritical CO 2 extraction technology is used extracting high purified lecithin from egg yolk powder.The extraction is curried out at 35 ℃~60 ℃,25 MPa~40 MPa,60 kg/h~90 kg/h of CO 2 flow.Determination demonstrate optimum conditions at 55 ℃,36 MPa~38 MPa and lecithin is obtained in 95 %~98 % of purity.The difficulty in using organic solvent is resolved by the method and the method has extensive perspective in industrial application.