Paeonia lactiflora root extract and preparation method thereof

The invention provides a Chinese herbaceous peony root extract and a preparation method thereof, and belongs to the technical field of plant extraction. The preparation method comprises the following steps: crushing radix paeoniae alba roots, performing enzymolysis, performing boiling extraction, performing alcohol precipitation to prepare radix paeoniae alba polysaccharide, performing supercritical fluid extraction on filter residues, adding butanediol and extract liquor, performing secondary molecular distillation to obtain a distillation product, adding water into solids and undistilled substances, a carbon source, a nitrogen source, vitamins and inorganic salt to prepare a culture medium, inoculating activated schizophyllumcommuneh and selenium-enriched saccharomycetes, and performing fermentation culture to obtain the selenium-enriched Schizophyllumcommuneh selenium-enriched Schizophyllumcommuneh selenium-enriched Schizophyllumcommuneh polysaccharide. And uniformly mixing the fermentation product with th