The invention discloses an insole for preventing and treating tinea pedis. The insole comprises an insole body and a medicine layer, wherein a sandwich layer is arranged in the insole body; the upper layer surface of the insole body is made into a mesh shape; the medicine layer is arranged in the sandwich layer of the insole body; and traditional Chinese medicinal materials are contained in the medicine layer, and comprise the following ingredients in parts by weight: 40 to 60 parts of radix sophorae flavescentis, 15 to 25 parts of broom cypress fruit, 8 to 15 parts of radix stemonae, 25 to 30 parts of dark plum, 1 to 3 parts of realgar, 25 to 35 parts of motherwort, 15 to 25 parts of rhizome of cyrtomium, 15 to 25 parts of dittany bark, 25 to 35 parts of dandelion, 8 to 12 parts of poria cocos peel, 8 to 12 parts of sophora twig, 8 to 12 parts of rhodiola rosea, 8 to 10 parts of trifoliate-orange seeds and 8 to 10 parts of sepium.