Protective agent for freeze-dried preservation of genetic engineering mushroom strains and preserving method of genetic engineering mushroom strains

The invention discloses a protective agent used in a freeze-dried preservation method of genetic engineering mushroom strains and a preserving method of genetic engineering mushroom strains. An ediblemushroom strain fermenting substance used in the technical scheme of the invention is used as the protective agent for freeze-dried preservation of the strains. Cultivation substances are fermented through edible mushroom strains such as cohabitant fungi, so that lignin and cellulose which are not liable to decompose at the normal state can be decomposed, organic compounds are fermented to decompose, and fermentation products and degradation substances contain various active micromolecules, such as micromolecular peptide, oligosaccharide and other low molecular weight substances of which thespecific chemical composition is still not found, which can maintain the integrity of cell membrane structure and protect the cell protein structure from being destructed. The implementation of the scheme proves that when an e