The invention belongs to a traditional Chinese medicine composition, and relates to Chinese herba external lotion for treating swelling of an upper limb of an affected side after breast cancer surgery. The Chinese herba external lotion is prepared by following raw materials including, by weight, from 9 to 11g of loofah, from 9 to 11g of hematoxylon, from 9 to 11g of angelica sinensis, from 9 to 11g of turmeric, from 9 to 11g of red paeony roots, from 9 to 11g of rhizoma ligustici wallichii, from 9 to 11g of cortex phellodendri, from 9 to 11g of rhizoma atractylodis, from 14 to 16g of radix sophorae flavescentis, from 14 to 16g of safflower carthamus, from 14 to 16g of glabrous greenbrier rhizome, from 14 to 16g of pericarpium zanthoxyli, from 14 to 16g of speranskia tuberculata, from 14 to 16g of common clubmoss herb and from 14 to 16g of suberect spatholobus stems. The Chinese herba external lotion has the advantages that the Chinese herba external lotion is fine in curative effect, low in cost, free of toxic and side effects and convenient in use and takes effects fast, a preparation method is simple, and raw materials are simple and easy to obtain.