The invention discloses a bean product preservative and application thereof. The bean product preservative comprises the following components in percentage by weight: 20%-60% of lauric acid monoglyceride, 20%-40% of an acidifying agent and 20%-50% of monostearin. The invention also provides application of the preservative to bean product preservation. The bean product preservative is capable of effectively inhibiting the growth of spoilage microorganisms in bean products and prolonging the shelf life of the bean products and also has a good defoaming effect; the components in the bean product preservative meet the national standard and can be applied to all the bean products; the bean product preservative is convenient to use, and the conventional process is not required to be changed, so that the bean product preservative can be widely used in the bean product preservation technology.