Preparation method of red card wall skeleton polysaccharide as well as product and application of red card wall skeleton polysaccharide

The invention provides a preparation method of red card wall skeleton polysaccharide as well as a product and application of the red card wall skeleton polysaccharide. The preparation method comprises the following steps: performing impurity removal and degreasing treatment on thalli after fermentation of red nocardia, and extracting cell wall skeleton polysaccharide by adopting a step-by-step enzymolysis method; and further separating and purifying through a DEAE-52 cellulose anion exchange column or glucan Sephadex G-15 and ultrafiltration to obtain a new red card wall skeleton polysaccharide. And finally, carrying out structural characterization on the obtained red kappa wall skeleton polysaccharide by using HPLC (High Performance Liquid Chromatography), an infrared spectrum and a nuclear magnetic resonance hydrogen spectrum. The prepared red card wall skeleton polysaccharide is complete in structure, low in toxicity and safe, can prevent skin barrier injury and promote the repair process of skin barrier i