The invention relates to a medicinal composition for treating leukemia, which comprises an effective ingredient and an adjuvant ingredient, wherein the effective ingredient is prepared from the following components in parts by weight: 8-12 parts of raw Concha Ostreae, 10-15 parts of Houttuynia cordata, 5-8 parts of Agkistrodon, 6-10 parts of Armadillidium vulgare, 3-5 parts of Bufo siccus (Bufo bufo gargarizans and / or Bufo melanostictus), 11-14 parts of Momordica cochinchinensis seed, 7-13 parts of Strychnos nux-vomica seed, 11-15 parts of Hirudo, 20-35 parts of Panax ginseng (Radix Ginseng), and 7-11 parts of Rabdosia longituba; and the adjuvant ingredient is prepared from the following components: Poria cocos, Pinellia ternata, Euphorbia pekinensis, Aconitum kusnezoffii, Corydalis decumbens, alunite, Glechoma longituba, Camptotheca acuminata, Rabdosia longituba, Allium fislulosum stalk, Corydalis yanhusuo, magnetite, Ziziphus jujuba (Fructus Jujubae), borneol, Saussurea involucrata, pearl powder, Flos Lonicerae, Radix Glycyrrhizae, Glycine max (Semen sojae atricolor), and loess. The medicinal composition provided by the invention has the advantages of short treatment course, quick action, good therapeutic effect, and so on.