The invention relates to a method for losing weight by hot-compressing externally-used traditional Chinese medicine. The method includes: mixing 25-35g of leonurus, 21-31g of folium sennae, 23-33g of liquorice, 21-31g of folium mori, 10-20g of syzygium aromaticum, 20-30g of borneol, 12-22g of radix angelicae, 15-25g of elecampane, 13-23g of pericarpium zanthoxyli, 18-28g of rheum officinale, 5-15g of poria cocos, 5-15g of dried tangerine or orange peel, 5-15g of pearl barley, 5-15g of semen plantaginis, 5-15g of semen cassiae torae, 5-15g of folium nelumbinis, 5-15g of common yam rhizome and 5-15g of semen raphani, grinding the mixture into powder, evenly stirring to make a cartridge bag, placing the cartridge bag right above the navel of a patient, covering through bedding, plugging in a power source of an electric blanket to perform heating for 20-30 minutes, and controlling the temperature to be between 30 DEG C and 35 DEG C. The method for losing weight by hot-compressing externally-used traditional Chinese medicine can improve the weight-losing effect, and is fast and convenient to operate, fast in absorbing, low in cost, safe, free of side effect, and favorable for achieving healthy weight loss.