The invention relates to a Chinese traditional medicine preparation, namely, an infusion drug used for treating tinea pedis, which is made from the materials with the following weight proportions: 30 grams of longhairy antenoron herb, fructus cannabis respectively, 20 grams of khosam, 7 grams of cantharis, 400 grams of white spirit with the alcohol strength being 60 DEG, and 500 grams of table vinegar. The invention is characterized in that the formula is novel, the production cost is low, the preparation is easy, the effect is remarkable and the recurrence rate is low.