The invention discloses a medicament for treating lymphoid tuberculosis and a preparation method thereof. The medicament comprises the following components in part by weight: 1 to 6 parts of kelp, 1 to 6 parts of seaweed, 1 to 6 parts of oyster shell, 1 to 6 parts of rhizoma smilacis glabrae, 1 to 6 parts of subprostrate sophora, 1 to 6 parts of wild buckwheat, 1 to 6 parts of perfoliate knotweed herb, 1 to 6 parts of bubble tree, 1 to 6 parts of nine rings, 1 to 6 parts of wild polygonum and 1 to 6 parts of citron day-lily. The medicament also comprises of wild buckwheat, schisandra propinqua leaf,chaulmoogratree, perfoliate knotweed herb, radix aconite and kusnezoff monkshood, and semen momordicae. The medicament is prepared by the following steps of: A, respectively taking 1 part of kelp, seaweed, oyster shell, rhizoma smilacis glabrae, subprostrate sophora, wild buckwheat, perfoliate knotweed herb, bubble tree, nine rings, wild polygonum and citron day-lily, and cutting into segments respectively; B, decocting the segments in a container for three times and merging into 60 milliliters of 100 percent decoction; C, taking the wild buckwheat and schisandra propinqua leaf and grinding into powder; and D, putting the ground powdery medicaments into the container, and adding warm boiled water, stirring uniformly and sealing. The medicament is used in a way that the finished liquid medicine is orally taken in three days; meanwhile, the pasty finished medicament is externally applied to the wound. The Chinese herbal medicament can effectively and radically cure the lymphoid tuberculosis disease.