The present invention discloses a feed use capsuled compound acidifier and a preparation method thereof. The feed use capsuled compound acidifier comprises the following components in parts by weight: 10-20 parts of fumaric acid, 2-15 parts of citric acid, 2-15 parts of malic acid, 2-30 parts of sorbic acid, 5-15 parts of lactic acid, 0.5-5 parts of ethyl cellulose, 20-50 parts of palm oil and 5-20 parts of lactic acid carriers. The acidifier is obtained by combining the various acids, can better regulate intestinal pH, improves the intestinal microbial balance of livestock and poultry, and improves the feed conversion rate. After the twice capsulations, the feed use capsuled compound acidifier is obtained especially by dissolving the palm oil to conduct the capsulation. The preparation method does not enable the acidifier to be exposed outside or relatively rapidly absorb moisture, and thus destroys other nutrients in the feed, so that the capsuled compound acidifier is not absorbed in stomach too fast, has a sustained release effect, and can better play the acidification and antibacterial roles in animal digestive tracts.