The invention discloses an external medicament for treating tinea pedis. The medicament consists of the following components by weight: 15 to 40g of golden thread, 5 to 20g of lightyellow sophora root, 5 to 15g of amur corktree bark, 10 to 45g of chinaberry bark and root-bark, 10 to 20g of liquoric root, 5 to 20g of cnidium monnieri, 5 to 25g of zedoary, 10 to 30g of sandalwood, 5 to 15g of borneol, 5 to 20g of gardenia, 5 to 15g of Mongolian dandelion herb, 1 to 2.5g of vitamin B1 and 100 to 500g of vaseline. The preparation method of the medicament comprises the following steps of: blending the golden thread, the lightyellow sophora root, the amur corktree bark, the chinaberry bark and root-bark, the liquoric root, the cnidium monnieri, the zedoary, the sandalwood, the gardenia and the Mongolian dandelion herb, selecting, cleaning, drying, baking and crushing the materials, and sterilizing the powder at a high temperature; blending the borneol and the vitamin B1 in proportion, crushing the mixture into fine powder, and screening the powder with a 200-mesh sieve; and blending the two kinds of medicinal powder and the vaseline, and uniformly stirring to obtain a pasty ointment.