Composition for improving skin state as well as preparation method and application thereof

The invention provides a composition for improving a skin state as well as a preparation method and application of the composition. The preparation method of the composition comprises the steps of primary fermentation, secondary fermentation, saponin extraction and purification and post-treatment. In the primary fermentation, a strain is bacillus subtillis. The fermentation temperature is 32-36 DEG C, and the fermentation time is 24-48 hours. The secondary fermentation comprises the following steps: adding a radix gentianae extract, a swertia japonica extract and total saponins of ginseng into a culture after the primary fermentation, and continuing to ferment and culture for 36-48 hours. And after fermentation, extracting to obtain the saponin extract. And mixing the saponin extract with ginsenoside CK, oat beta glucan, a radix gentianae extract and a swertia japonica extract to obtain the product. The product provided by the invention can inhibit the expression of metal protein and reduce the degradation of