Polysaccharide extraction device and method for dried stachys siebolidii

The invention discloses a polysaccharide extraction device and method for dried stachys siebolidii. The polysaccharide extraction device comprises a smashing mechanism, a water extraction mechanism and an alcohol precipitation mechanism which are arranged in a series connection way; the smashing mechanism comprises a first shell; the inner wall of the first shell is provided with a metal sleeve; the first shell is in clearance fit with the metal sleeve; a plurality of first through holes are formed in the metal sleeve; the center of the first shell is provided with a first stirring shaft on which smashing blades are fixedly arranged; the first through holes are internally sleeved with sleeve pipes longer than the first through holes; the ends, located at the outer side of the metal sleeve,of the sleeve pipes are provided with arc-shaped through grooves; the ends, located at the inner side of the metal sleeve, of the sleeve pipes are provided with expansions; and gas injection pipes are arranged between the fi