NOVELTY - Purification of cherry saponins involves a) crushing dried black dense flower tree leaf, adding supercritical extraction kettle, under condition of extracting pressure of 28-35 MPa, and temperature of 40-60 degrees C, introducing liquid carbon dioxide and entrainer supercritical extracting for 2-3 hours at 35-42 degrees C and pressure of 6-9 MPa; b) concentrating extracting liquid to alcohol, adding ethyl acetate, adding chloroform and stirring, concentrating mother liquor to obtain extract, c) high speed counter current chromatography purification of extract, and drying to obtain product.    USE - For purification of cherry saponins (claimed) useful for improving calcium channel function.    ADVANTAGE - The method is efficient and fast, and is suitable for high purity cherry saponin production. Using method of supercritical CO2 extraction, the extraction efficiency and the solvent capacity is high, and can reduce the pollution to the environment. Using method of high speed countercurrent chromatography purification, the method is simple and easy to operate, less solvent dosage, no sample loss, large amount of preparation, capable of continuously producing, and there is no pollution.    DETAILED DESCRIPTION - Purification of cherry saponins involves a) crushing dried black dense flower tree leaf into 60-80 mesh, adding supercritical extraction kettle, under the condition of extracting pressure of 28-35 MPa, and temperature of 40-60 degrees C, introducing liquid carbon dioxide (CO2) and entrainer supercritical extracting for 2-3 hours at 35-42 degrees C and a pressure of 6-9 MPa; b) concentrating obtained extracting liquid to alcohol (35-40%), adding ethyl acetate to stir, removing the ethyl acetate layer, using acid to adjust pH 3.5-4.5, adding chloroform and stirring, removing chloroform layer, concentrating mother liquor to obtain the extract, c) using high speed counter current chromatography purification, evaporative light-scattering detector at line monitoring, collecting target component according to pattern, recycling reagent, decompressing and drying to obtain the product.