The invention discloses application of a dihydromyricetin metal complex serving as a feed additive. The dihydromyricetin metal complex serving as the feed additive is added into the feed of live stock, so that growth of the live stock is promoted, meat quality is improved, eggshell hardness is improved, milk production is promoted, use of antibiotic is reduced, and the dihydromyricetin metal complex is healthy and environment-friendly. In addition, the invention also discloses a preparation method for the dihydromyricetin metal complex. The dihydromyricetin metal complex prepared by the method has the biological activity of dihydromyricetin; and more metal elements with active effects on animal nutrition can be introduced under the condition that the total quantity of the dihydromyricetinis not changed.