The invention discloses a traditional Chinese medicine plaster for treating wet rheumatism, which is decocted from 2g of buttercup, 0.3g of desmodium, 0.3g of rehmanniae, 2g of potentilla, 0.5g of cortex lycii radicis, 0.5g of borneol, 0.2g of gardenia, 0.1g of dahurian angelica, 0.5g of Chinese goldthread, 0.3g of safflower, four chilopods, eight scorpions, one inch of wind dhumnades, two hoptoads, 500g of balm and 250g of yellow lead according to a traditional method. The invention prescribes the drugs, has the functions of clearing away heat and toxic material, resisting inflammation, interesting wind antispasmodic, eliminating toxic material and removing stasis, activating meridians stop pain, dispersing pathogenic wind detumescence and activating blood to resolve stagnation, and has good healing effect for wind cold dampness evil diseases.