The present invention belongs to the field of animal feed, and in particular relates to a new use of Astragalus membranaceus seed for preparing an artificial feeding animal feed. The added amount of the Astragalus membranaceus seed is 2-8% based on the animal feed. The Astragalus membranaceus seed is used for improving the animal production performance, slaughter performance, immune function, lipid metabolism function and antioxidant function.