The invention discloses a method to distill yamogenin by using biology enzyme stage catalyzing that belongs to distill yamogenin from yam plant field. The method includes the following steps: adding shield-leaf yam or 'chuanlong' yam into biology reactor, and adding amylase, maltogenic amyiase, petinase, or emulsin, rough hesperidinase, maltogenic amyiase; or compounding cellulose, pentosan compounding enzyme and maltogenic amyiase processing for a while, taking stage catalyzing reaction; adding a certain consistency acid solution to take acid hydrolysis; washing to neutrality by basic salt solution; dipping for a certain while by non-polarity solution refluence; concentrating by evaporation, and crystallizing to gain product. The advantage of the invention is the distilling ratio of yamogenin could reach over 95%, low energy consumption and low producing cost. |