The invention discloses a Chinese traditional medicine plaster, in particular a Chinese traditional medicine plaster for treating ecthyma and a preparation method thereof. The Chinese traditional medicine plaster for treating ecthyma is characterized by being prepared from the following components: calomel, red lead, verdigris, fried mastic, fried myrrh, dragon's blood, red sage root, musk, pangolin, crinis ustus, bee wax and sesame oil. The Chinese traditional medicine plaster of the invention is specially used for treating ecthyma; various medicines are properly matched, and synergistic action or resistant action among the medicines is used for improving the treatment effect, adapting to the treatment requirements on complex diseases and reducing the adverse reaction; and the Chinese traditional medicine plaster of the invention can be used for treating both principal and secondary aspects of diseases, has no need of firing and heating, has very strong penetration and absorption capacities, can directly act on affected parts, has fast and lasting treatment effect, can be externally used conveniently, is safe and reliable, has no side effect, and has better effect on treating ecthyma. The Chinese traditional medicine plaster is used for totally treating 750 cases, and the total effective rate reaches 95%.