The present invention discloses a mink feed additive for prevention and adjuvant treatment of hemorrhagic pneumonia and a preparation method thereof. The prepared feed additive consists of the following raw materials in parts by weight: 15-20 parts of fresh Chinese cabbage products, 4-6 parts of bitter apricot kernels, 10-12 parts of galla chinensis, 6-8 parts of bulbus fritillariae cirrhosae, 12-15 parts of fresh portulaca oleracea products, 8-12 parts of chicken embryos, 10-14 parts of radix pulsatillae, 6-9 parts of fresh enteromorpha prolifera products, 6-8 parts of honeysuckles, 7-10 parts of haws, 7-9 parts of mangosteen peels, 1-3 parts of honey preserved radix stemonae, 5-8 parts of Japanese ardisia herbs, 3-6 parts of cortex mori and 9-13 parts of rice brans. The feed additive is prepared from the Chinese herbal medicines and natural edible materials, safe, non-toxic and free of side effects in recipe, can supplement nutrition, enhance the own immunity of minks, can assist antibiotics in curing mink hemorrhagic pneumonia after the feed additive is used to feed affected animals, increases the cure rate, and at the same time can effectively reduce the incidence rate and play a very good preventive effect after the unaffected animals are fed by the feed additive.