Composition for promoting metabolism of aged skin as well as preparation method and application of composition

The invention belongs to the technical field of cosmetics, and discloses a composition for promoting metabolism of aged skin and application of the composition. The composition for promoting metabolism of the aged skin is prepared from, by weight, 0.1-1 part of peach blossom extract and 1-3 parts of lactobacillus leavening, and a preparation method of the peach blossom extract comprises the steps that fresh peach blossoms are dried and smashed, an ethanol solution is added, ultrasonic-assisted extraction and filtration are conducted, a clarifying agent is added into filtrate, standing and centrifugation are conducted, supernate is collected and concentrated under reduced pressure, and the peach blossom extract is obtained. Adding a solvent, uniformly stirring, filtering by using a microfiltration membrane and an ultrafiltration membrane in sequence, and collecting filtrate, thereby obtaining the product. The preparation method of the lactic acid bacteria fermentation product comprises the following steps: ino