The invention relates to a medicine and particularly relates to a tong therapy medicine for treating knee osteoarthritis. The medicine comprises the following components in parts by weight: 90-100 parts of garter snake, 60-70 parts of anise, 60-70 parts of perillaseed, 60-70 parts of semen brassicae, 20-30 parts of red flower, 50-60 parts of achyranthes root, 50-60 parts of garden balsam stem, 45-50 parts of frankincense, 45-50 parts of myrrh, 40-50 parts of rhizoma arisaematis, 20-25 parts of processed semen strychni, 40-50 parts of asarum, and 40-50 parts of ephedra. The medicine is prepared from traditional Chinese medicines and adopts tong therapy; warm effect of traditional Chinese medicine tong therapy and the traditional Chinese medicines of the medicine cause partial blood capillary to dilate so as to improve and increase blood supply around the knee and promote absorption and elimination of products of chronic inflammation, adhesion, infiltration and effusion of the knee and around the knee to promote blood circulation to remove blood stasis, dehumidify and diminish inflammation, activate meridians to stop pain, and recover the function of the knee.