The invention discloses a preparation method of a Chinese medicine irrigation solution for treating pruritus type trichomonas vaginitis, belonging to the technical field of preparation method of Chinese medicines. At present, generally, antibiotics and sulfanilamide medicines are used for treating pruritus type trichomonas vaginitis, and the disadvantage is large toxic and side effect. The Chinese medicine irrigation solution disclosed herein is prepared by putting 38 kinds of herbs consisting of fructus cnidii, rhizoma atractylodis, periostracum cicadae, herba schizonepetae, sophora flavescens, balsam pear, ilex latifolia thumb, Elephantopus scaber, polygonum cuspidatum, saxifrage, Galium aparine, dysosma versipelis, berberis poiretii schneid, starwort root, creeping oxalis, Rhamnus, veronicastrum herb, daghestan sweetclover herb, coffee senna, common alstonia bark leaf, lophantherum gracile, mung bean, dandelion, sedum, herb of common corydalis, shrubby breynia, small-leaved desmodium, wintercherry, Jeffersonia dubia, uniflower swisscentaury root, olive, small-leaved lemmaphyllum, acanthaceae, gamboge, potentilla disclor bunge, senecio scandens, Huperzia serrata and liquorice inwater for soaking, then decocting with slow fire, filtering and removing the residues to obtain a liquid medicine. The Chinese medicine irrigation solution disclosed herein has the advantages of small toxic and side effect, short treatment course and high cure rate.