odium dehydroacetate is a broad-spectrum food preservative with extremely strong antibacterial power, and it has a particularly strong inhibitory effect on molds and yeasts. Under the same addition amount, the antibacterial effect is several times or even dozens of times higher than that of the widely used sodium benzoate and potassium sorbate at present. What is particularly valuable is that it has a very small inhibitory effect on acid-producing bacteria, especially lactic acid bacteria. In accordance with relevant national standards and the recommendations of the US FCC, it is applicable to fermented bean curd. It is used for the preservation and mold prevention of various products such as mixed sauce, pickles, sauerkraine, original fruit juice, concentrated fruit juice, fruit wine, cheese, cream, margarine, yogurt, lactic acid beverages, carbonated beverages, red bean paste, bread, mooncakes, pastries, sweet bean sauce, canned food, condiments, health products, cosmetics, etc. Especially for products such as lactic acid beverages, pickles, sauerkraues, and preserved vegetables that need to suppress other harmful bacteria as much as possible while reducing the inhibition of beneficial lactic acid bacteria.