Compound protective agent, preservation method and application of bitter melon extracting liquid

The invention is suitable for the fields of medicine, health care and chemicals and provides a preservation method of bitter melon extracting liquid. A compound protective agent is added to the bitter melon extracting liquid, standing is performed in a dark place for 24-48 hours, and storage is performed; the compound protective agent is prepared from phytic acid, nicotinamide and glucolactone, wherein the mass-to-volume ratio of the phytic acid to the bitter melon extracting liquid is 0.035%-0.065%, the mass-to-volume ratio of the nicotinamide to the bitter melon extracting liquid is 0.3%-0.5%, and the mass-to-volume ratio of the glucolactone to the bitter melon extracting liquid is 0.25%-0.35%. The invention further provides the compound protective agent of the bitter melon extracting liquid. The compound protective agent contains the phytic acid, the nicotinamide and the glucolactone. By the adoption of the preservation method of the bitter melon extracting liquid and the compound protective agent, the oxi