Preparation method and application of glycyrrhiza polysaccharide effective part

The invention relates to a preparation method and application of a glycyrrhiza polysaccharide effective part, which comprises the following steps: naturally drying liquorice rhizomes, mechanically crushing, screening to separate impurities, degreasing with petroleum ether, depigmenting with absolute ethyl alcohol, naturally air-drying, extracting with hot water, centrifuging, concentrating, precipitating with absolute ethyl alcohol, centrifuging again, dissolving polysaccharide precipitate with water, deproteinizing, dialyzing to obtain the anti-inflammatory effective part of liquorice, performing vacuum freeze drying to obtain water-soluble glycyrrhiza polysaccharide, and purifying the water-soluble glycyrrhiza polysaccharide through ion exchange resin and a sephadex chromatographic column to obtain an effective part of glycyrrhiza polysaccharide, so that the total sugar content of the polysaccharide effective part reaches 94.87%, the uronic acid content is 8.76%, and the protein content is 3.14%. The glycyr