The invention discloses a preparation method of a Chinese medicine irrigation solution for treating liver-fire excess 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 liver-fire excess type trichomonas vaginitis, such as ampicillin, excessive use always causes gastrointestinal intolerance, intramuscular injection causes local pains, oral administration or intramuscular injection can cause allergic reaction, and the most manifestation is rash. The Chinese medicine irrigation solution disclosed herein is prepared by putting 16 kinds of herbs consisting of celosia seeds, butterflybush flower, pipewort, scouring rush, chrysanthemum, mint, periostracum cicadae, Dictamnus dasycarpus Turcz, sophora flavescens, balsam pear, ilex latifolia thumb, Elephantopus scaber, polygonum cuspidatum, saxifrage, gentian and licorice in water 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, and can avoid the adverse effects of applying western medicines.