The invention discloses a preparation method of a Chinese medicine irrigation solution for treating frequent micturition and urgent micturition 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 frequent micturition and urgent micturition type trichomonas vaginitis, and the disadvantage is large toxic and side effect. The Chinese medicine irrigation solution disclosed herein is prepared by putting 25 kinds of herbs consisting of pericarpium arecae, nericum indicum, waxgourd peel, phaseolus calcaratus, Zanthoxylum bungeanum Maxim, stigma maydis, bottle gourd peel, dayflower, Polygonum aviculare, pink herb, caulis akebiae, Tetrapanax papyriferus, junci medulla, shepherdspurse herb, Convallaria majalis, mole cricket, sophora flavescens, balsam pear, ilex latifolia thumb, Elephantopus scaber, polygonum cuspidatum, saxifrage, Tetrapanax papyriferus, daylily root 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 simple preparation, small toxic and side effect, short treatment course and high cure rate, and can avoid the adverse effects of applying western medicines.