Feed liquid nutrient additive and preparation method and application thereof

The invention discloses a feed liquid nutrition additive and a preparation method and application thereof. The feed liquid nutrition additive is an oil-in-water emulsion, and an average particle sizeof dispersed droplets and/or emulsified particles is 70nm or less; the feed liquid nutrition additive comprises the following components: a soybean oil deodorized distillate, a food-grade emulsifier,a fat-soluble nutrient additive, a water-soluble nutrient additive and water, wherein the HLB value of the food-grade emulsifier is 10 to 14. The preparation method of the feed liquid nutrition additive comprises the following steps: 1, weighing the raw material according to a formula, and uniformly stirring and mixing the soybean oil deodorization distillate, the food-grade emulsifier and the fat-soluble nutrient additive; 2) dissolving the water-soluble nutrient additive with part of water, and adding the rest of water after dissolving; and (3) shearing and mixing the mixed solution preparedin the step (2) with the u