The invention relates to the technical field of medicine for animals, in particular to a traditional Chinese medicinal composition for treating porcine circovirus and a preparation method of the traditional Chinese medicinal composition. The traditional Chinese medicinal composition comprises, by weight, 15-20 parts of gypsum, 5-10 parts of fructus forsythia, 15-20 parts of honeysuckles, 15-20 parts of isatis roots, 10-15 parts of herba andrographitis, 10-15 parts of radix zanthoxyli, 10-15 parts of agastache rugosus, 5-10 parts of semen cannabis, 5-10 parts of millet sprouts, 5-10 parts of angelica sinensis, 5-10 parts of licorice roots and 5-10 parts of astragalus membranaceus. The traditional Chinese medicinal composition has the advantages that twelve traditional Chinese medicinal herbs are selected optimally according to the traditional Chinese veterinary theories; the traditional Chinese medicinal herbs are extensive in source and low in cost; clinical application proves that through scientific and reasonable compatibility of the traditional Chinese medicinal herbs, the prepared traditional Chinese medicinal composition has remarkable curative effect on the porcine circovirus, and the cure rate reaches over 90%.