The invention relates to a method for preparing traditional Chinese medicine lotion for treating lower limb bedsore, which belongs to the technical field of a traditional Chinese medicine preparation method. Sulfanilamide grous and antibiotics are ordinarily adopted for treating the lower limb bedsore at present, but some adverse reactions can be easily caused. The method has the technical schemethat: plumbago zeylanica, long-noded pit viper, loofah sponge, rose mallow herb, geranium wilfordii, korean monkshood root, berba aristolochiae mollissimae, tetrandra root, robust leontice rhizome and root, lycopodium clavatum, caulis sinomenii, potentilla chinensis, rhizoma cibotii, rhododendron molle, kusnezoff monkshood, Chinese artichoke, trogopterus dung, pseudo-ginseng, setose thistle, camellia flower, field thistle, osbeckia chinensis, artemisia leaf, cactus, hairyvein agrimony, bletilla, terra flava usta, crinis ustus, rumex japonicus, marmor serpentinatum, ramie root, madder root, common sage herb, hollyhock flower, eclipta, radix angelicae pubescentis and liquorice are taken, the traditional Chinese medicines are put into water to be soaked, then, the liquid is decocted by slow fire, dregs are removed through filtering, and the decocted liquid medicine is the traditional Chinese medicine lotion for treating the lower limb bedsore. The method has the advantages that the prepared traditional Chinese medicine lotion has the advantages that the treatment period is short, and the cure rate is high. When the traditional Chinese medicines are adopted, adverse reaction, anaphylactic reaction and toxic reaction caused by western medicine are avoided.