Acanthopanax senticosus harms homogeneous polysaccharide, preparation method therefor and use thereof

Disclosed is an Acanthopanax senticosus Harms homogeneous polysaccharide, having a molecular weight of 6.83 × 105Da, and consisting of arabinose, galactose, glucose, mannose and xylose, with the mole percentages of the various monosaccharides sequentially being 16.42%, 32.27%, 40.38%, 7.21% and 3.72%. A method for preparing the Acanthopanax senticosus Harms homogeneous polysaccharide is specifically as follows: crushing Acanthopanax senticosus Harms decoction chips into a powder, extracting the Acanthopanax senticosus Harms crude polysaccharide by means of a water extraction method, then removing proteins from the crude polysaccharide by means of a Sevage deproteinization method, and performing further separation and purification by means of an anion exchange DEAE Fast Flow chromatographic column and a Sephadex G-200 glucan gel column chromatographic column, in order to obtain the Acanthopanax senticosus Harms homogeneous polysaccharide. The Acanthopanax senticosus Harms polysaccharide prepared by means of this method is a homogeneous polysaccharide, has antioxidant and anti-skin aging activity, and can be used for preparing cosmetics and drugs with an anti-skin aging effect.