A preparation method of a traditional Chinese medicine lotion for treating swelling type cellulitis belongs to the technical field of traditional Chinese medicine preparation methods. Currently, antibiotics and sulfanilamide medicaments are generally used for the treatment of swelling type cellulitis, and have the disadvantage of great side effect. The technical scheme of the invention is that the preparation method comprises the following steps: soaking the following 43 herbs of skink, wax gourd peel, malva seed, broom cypress fruit, oleander, polygonum perfoliatum, juncus, Jiangxi desmodium, manshurian dutchmanspipe stem, red bean, desmodium, alisma, tuckahoe, starwort, oxalis, rhamnus, veronicastrum herb, Daghestan sweet clover herb, coffee senna seed, common alstonia, common lophatherum herb, mung beans, dandelion, sedum, shortstalk slimtop meadowrue root, shrubby breynia, small-leaved desmodium, winter cherry, jeffersonia dubia, uniflower swisscentaury root, olive, small-leaved lemmaphyllum, creeping rostellularia herb, gamboge, discolorous clinquefoil root, siberian elm bark and licorice in water, decocting with mild fire, filtering to remove residues so as to obtain the medicinal liquid which is the traditional Chinese medicine lotion for treating swelling type cellulitis. The advantages are that the traditional Chinese medicine is short in treatment course, and high in cure rate, and can also prevent adverse effect caused by western medicine administration.