A topical drug for treating tympanitis and its producing method belong to medicine technical field, which is used for treating the simple chronic suppurative otitis media with a project that: having the furazolidone 1.8-2.2, vitamin E 0.9-1.1, benne oil 25-65 as material, preparing, milling, mixing, bottling, then getting the topical drug liquid. The invention collects the treatment advantages of the chinese and foreign medicine to the local fester induced by bacillosis, selects the furazolidone, benne oil, vitamin E in proportion to produce topical drug for treating tympanitis, preferred chronic suppurative otitis media. Clinic application indicates that the drug is used for treating simple chronic suppurative otitis media and taking one time a day and working three day in a treatment period. It could properly prolong the treatment time with 100% efficiency to the patent with a long course of disease and a severe symptom. The invention also has a simple medication, a low toxic side effect, a low price, a strong patent compliance and etc.