The invention provides a medicament for treating eczema infection. The medicament comprises the following raw materials in parts by weight: 1.5-2.5 parts of honeycomb, 2.5-3.5 parts of crown treacle scape and 4.5-5.5 parts of Chinese mugwort leaf. The medicament is prepared by putting the raw materials into an earthen pot proportionally; and adding 100 parts of water for decocting for 1.5-2.5 hours. The obtained medicinal coup is used for cleaning eczema-infected positions. The medicament for treating eczema infection provided by the invention has the advantages of remarkable curative effect, no toxic or side effect, readily-available raw materials, low cost and convenience for taking.