Extraction process of lychee seed saponin

The invention provides an extraction method of saponin, especially relates to an extraction method of lychee seed saponin, and belongs to the technical field of plant extraction. The process flow comprises the following steps: crushing lychee seeds, extracting the lychee seeds with petroleum ether, chloroform and ether respectively, and performing purification by high-speed countercurrent chromatography. The extraction method of lychee seed saponin provided by the invention adopts multiple extraction separation to separate lychee seed saponin crude extract, effectively obtains active components from the crude extract, removes impurities, and reaches a product yield and purity higher than those of routine methods.