The invention provides a fresh flower preservative. The fresh flower preservative comprises the following components in parts by mass: 25 to 35 parts of cane sugar, 15 to 25 parts of chitosan, 8 to 12 parts of propolis supercritical CO2 extracts, 4 to 6 parts of natamycin, 1.6 to 2.0 parts of citric acid, 0.8 to 1.2 parts of salicylic acid, 0.6 to 0.8 part of boric acid, 0.6 to 1.0 part of vitamin C, 0.5 to 0.7 part of vitamin E, 60 to 100 parts of traditional Chinese herbal medicine ethanol extracting liquid and the balance of ultrapure water, wherein the total parts are 1000 parts. The fresh flower preservative provided by the invention has a reasonable formula, safe and environmentally-friendly components, a good nutrition effect and an excellent broad-spectrum antibacterial effect, can effectively inhibit damage to fresh flowers by various microorganisms, greatly prolongs the freshness-retaining period of the fresh flowers, has significant color-protecting and color-improving effects, is simple in preparation method, and is simple and convenient to operate during use.