The invention relates to the technical field of breeding, and discloses a feed additive for preventing and treating swine plague. The feed is prepared from the following raw materials of bothriospermum chinense, dandelions, amaranthus spinosus, equisetum arvense, scirpus planiculmis, prenanthes tatarinowii, cephalanthus occidentalis, mussaenda erosa champ, radix cudraniae, thunbergia grandiflora, nupharis rhizoma, marsdenia tenacissima, dragon's blood, polygonum orientale, herba pouzolziae zeylanicae, black bean powder, bacillus natto, beer yeast, a spinach seed extract, lycopene and complex enzymes. The using quantity of the additive is low, and the feed additive does not contain any toxic reagents or antibiotics, cannot cause remaining, and is notable in preventing and treating effects. According to the feed additive, the occurrence rate of swine plague is reduced to 0-1%, after pigs are fed with the feed additive, the pork quality is delicious, the pork is pink in color, and the grade of the pork is increased; the spinach seed extract and the lycopene are added, so that disease-resistant components are increased, the immunity of the pigs is improved, swine plague and other diseases can be restrained fundamentally, the mouth feel and the color of the pork are improved, and the breeding revenue is increased by 14.3%.