Paeonia ostii polypeptide with anti-wrinkle and firming effects as well as preparation method and application of paeonia ostii polypeptide

The invention discloses paeonia ostii flower polypeptide with anti-wrinkle and firming effects and a preparation method and application thereof, and belongs to the technical field of polypeptide enzymolysis processing. The preparation method comprises the following steps: (1) drying and crushing Paeonia ostii to obtain Paeonia ostii powder, cooking the Paeonia ostii powder in purified water, filtering to obtain filtrate and flower residues, and fermenting the flower residues to obtain Paeonia ostii fermentation liquor; (2) performing enzymolysis on the paeonia ostii fermentation liquor by using protease to obtain a paeonia ostii crude extract; and (3) carrying out membrane filtration, vacuum concentration, decoloration and drying on the paeonia ostii flower crude extract to obtain the paeonia ostii flower polypeptide. According to the method, paeonia ostii flowers are used as raw materials, grease in the flowers is removed after high-temperature cooking, flower residues are fermented and subjected to enzymoly