The present invention relates to the technical field of agricultural product fresh-keeping, particularly to a Sanhua plum fresh-keeping agent and a preparation method thereof, wherein the raw materials comprise 10-13 parts of a pomegranate peel extraction liquid, 10-13 parts of a
caesalpinia sappan l extraction liquid, 10-13 parts of a
rubia cordifolia l extraction liquid, 15-17 parts of a mustard extraction liquid, 15-17 parts of a
brassica juncea extraction liquid, 10-15 parts of a hot pepper extraction liquid, 15-20 parts of a
capsicum annuum l extraction liquid, 10-15 parts of a licorice root extraction liquid, 10-12 parts of a
lotus stem extraction liquid, 11-13 parts of a radish extraction liquid, 12-14 parts of a
cypress leaf extraction liquid, 15-20 parts of a
tea leaf extraction liquid, 10-15 parts of
sabina chinensis oil, 3-5 parts of a maleic
hydrazide solution, and 3-5 parts of a 2,4-
dichlorophenoxyacetic acid solution, and
raw material treatment, extraction liquid preparation, blending and other steps are performed to prepare the Sanhua plum fresh-keeping agent. According to the present invention, the Sanhua plum fresh-keeping agent has characteristics of reasonable formula, simple method, wide antibacterial range, good effect, reduction of breath and other metabolisms, effective reduction of problems of Sanhua plum mildewing and rotting and the like, storage time prolonging, and sensory quality maintaining.