The invention discloses a laying fowl feed additive and an application thereof. The laying fowl feed additive comprises the following raw materials in parts by weight: 20-50 parts of component A, 1-20 parts of B-group vitamin, 1-20 parts of component B, and 1-60 parts of medium-chain fatty acid, wherein the component A is coating short-chain fatty acid or coating short-chain fatty acid salt; the component B is at least one of beta-carotene, vitamin A, vitamin C and vitamin E; and the component B accounts for not larger than 1% of mass of the laying fowl feed additive. The component A, the B-group vitamin, the component B and the medium-chain fatty acid are adopted as main components, not only can the intestinal injury of laying fowl be restored, and can the physical quality of the laying fowl be enhanced, but also the development of fallopian tube of the laying fowl can be effectively promoted, and the inflammation of fallopian tube and ovary of the laying fowl can be diminished.