The invention relates to a liquid medicine for treating burn; the liquid medicine is prepared by the following ingredients in terms of part by weight: 90-110 portions of prednisone tablets, 70-110 portions of maleate chlor-trimeton tablets, 180-220 portions of vitamin B1 tablets, 13-17 portions of dexamethasone tablets, 5-8 portions of chloramphenicol eyedrop and 90-110 portions of distilled water. In preparation, all ingredients are taken in proportion; prednisone tablets, maleate chlor-trimeton tables, vitamin B1 tablets and dexamethasone tablets are dissolved in distilled water or smashed before being dissolved in distilled water, added with chloramphenicol eyedrop and evenly mixed. The antibiotic, anti-flammatory and anti-allergic functions of the liquid medicine can ensure the burnt skin does not be invaded by external bacteria and keep the cleanness, so that the burnt skin can be healed in a short time; the liquid medicine can be used for treating burn, scald, cauterized wound, and on the like, has the advantages of low treatment cost, short healing time, and no scar, and can also be used for treating tympanitis with good curative effect.