Method for extracting diosgenin saponin and rhamnose by using rhizoma dioscoreae zingiberensis

For solving the problem that rhizoma dioscoreae zingiberensis resources are insufficient and a large amount of wastes are produced, so that the development prospect of the long-term use of rhizoma dioscoreae zingiberensis is seriously affected, but by using currently adopted extracting methods, a large amount of wastes are still caused to the environment, the invention discloses a method for extracting diosgenin saponin and rhamnose by using rhizoma dioscoreae zingiberensis, which can produce diosgenin saponin and rhamnose in a large scale from rhizoma dioscoreae zingiberensis by using extraction, crystallization and recrystallization methods, and can improve the yields of diosgenin saponin and rhamnose in rhizoma dioscoreae zingiberensis.