Slow-release compound feed additive and preparation method thereof

The invention provides a slow-release compound feed additive and a preparation method thereof. The slow-release compound feed additive comprises glucose oxidase, an additive inner core and a coating, wherein the additive inner core comprises cinnamyl aldehyde, eugenol, carvacrol, peppermint oil, anise oil, thymol, microcrystalline cellulose and polyethylene glycol 400; the coating comprises an inner-layer coating and an outer-layer coating; the inner layer coating wraps the additive inner core, and the outer layer coating wraps the inner layer coating. The sustained-release compound feed additive is coated by a coating technology, so that the heat resistance of the additive in a feed granulation process is greatly improved, the characteristic that essential oil components are volatile at high temperature is effectively improved, and a certain sustained-release effect is achieved, so that the effective components of the additive can be released in a small amount in a stomach stage and effectively released in i