Belonging to the technical field of traditional Chinese medicine preparation methods, the invention relates to a preparation method of a Chinese medicinal lotion treating heat-toxin type closed fractures. Current treatment of heat-toxin type closed fractures usually adopts western medicines, and the drawback is that certain side effects exist. The technical scheme of the invention comprises: taking climbing groundsel herbs, Japanese Stephania Roots, patience dock roots, Ilex pubescens, Herba patriniae, Changium smyrnioides, Hemsleya macrosperma, anemarrhena asphodeloides, Radix Tinosporae, Trollius chinensis, honeysuckle, Bidens biternata, Houttuynia cordata, Lespedeza cuneata, Hypericum perforatum, Sedum sarmentosum, Sagina subulata, siberian elm barks, carps, Polyporus, astragalus henryl, coix seeds, waxgourd peels, Phaseolus calcaratus, Zanthoxylum bungeanum Maxim, Corn Stigma, Lagenaria siceraria, Commelina communis, Polygonum aviculare, Dianthus Superbus, akebia stems, Ricepaperplant Pith, Juncus effusus, huperzia serrata and licorice, immersing the 35 Chinese herbal medicines in water, and then conducting decocting by slow fire, carrying out filtering to remove residues, thus obtaining a decocted liquid medicine, i.e. the Chinese medicinal lotion treating heat-toxin type closed fractures. The Chinese medicinal lotion prepared by the method has the advantages of: small toxic and side effects, short treatment course, and high cure rate.