The invention relates to a bactericidal and fresh-keeping agent for garlic bolts, and belongs to the technical field of food fresh-keeping. The fresh-keeping agent is composed of the following substances in parts by weight: 3-5 parts of xanthium sibiricum, 2-4 parts of blond magnolia flowers, 2-4 parts of divaricate saposhnikovia roots, 1-3 parts of licorice, 15-20 parts of imazalil sulfate, 0.1-0.2 part of gibberellin, 1-3 parts of boric acid and 77-80 parts of sodium sulfate. The fresh-keeping agent can effectively reduce mildew growing on garlic bolt tips in a storage period, has the advantages of safety, no toxin, no residue, and difficulty to generate resistance, and can effectively keep the freshness of vegetables and prolong storage time.