The invention relates to a preparation method of 
ginseng polysaccharide extractive. 
Ginseng coarse 
powder is adopted, 
ethanol of 60 percent to 80 percent which occupies eight times to ten times of the amount of 
ginseng coarse 
powder is added to perform 
reflux extraction for two to three times, decoction dregs is filtered to clean out 
ethanol, the 
purified water ten times to fifteen times of the decoction dregs is added, then 
hydrochloric acid is added, the pH value is regulated to be one to three, boiling-out is performed for half to two hours, the decoction dregs is filtered to repeat boiling-out once, the extracted solution is combined, filtered through and decompressed and condensed, to obtain the extracted concentrated solution, 
hydrochloric acid is added in the extracted concentrated solution, the pH value is regulated to be one to three, 
hydrogen peroxide four times to six times of the amount of 
hydrochloric acid is added and is agitated and thermally preserved under the temperature of 85 DEG C to 95 DEG C for one to three hours, the extracted concentrated solution is cooled to the 
room temperature and filtered, and the concentrated solution after being decolorized is obtained; the pH value of the concentrated solution after being decolorized is regulated by utilizing NaOH to be three to five, 
ethanol two times to five times the concentrated solution is added, the concentrated solution is evenly agitated and is allowed to stand, 
precipitation is leached and cleaned for one time by utilizing ethanol with 60 percent to 80 percent containing HCl with 0.2 percent to 2.0 percent, the precipitate is dissolved through water, the 
alcohol precipitation washing and the acid 
alcohol washing are respectively repeated for once, and white 
ginseng polysaccharide extractive is obtained..