The invention discloses a preparation method of an enveloping acidulant for feeds, and belongs to the technical field of feed additives. According to the preparation method disclosed by the invention, essential oil is coated with cyclodextrin, a traditional fatty acid enveloping substance is replaced, and the cyclodextrin and the essential oil slowly release and decompose in the stomach and the intestine, so that the release time of the acidulant in animal bodies is shortened, foraging of animals is promoted, and besides, the enveloping acidulant has excellent antibacterial properties, effectively prevents harmful bacteria in gastrointestinal tracts from proliferating, and promotes beneficial bacteria to propagate; besides, the enveloping acidulant is free from excessive fatty acid, effectively controls fatty acid taken in by the animals, protects the livers of the animals, shortens the growth time of the animals, and prolongs the life of the animals; zeolite is used for fixed cross-linking and adsorption modification, so that the quantity of oxygen free radicals is reduced, and the animal organisms are protected; synthetized or modified zeolite can also alleviate the oxidation process in muscular tissues, and can effectively overcome the defects that essential oil is easy to oxidize and decompose in human bodies and enveloping substances are consumed untimely, and the utilization efficiency of the acidulant is improved.