Method for preparing preparation for treating gastroenteritis and its new use

The present invention discloses a preparation method and a new usage of a pharmaceutical preparation for treating enteritis. The preparation method is that: the Chinese mosla herb is distilled by using water vapor or is extracted the volatile oil by refluxing/supercritical extraction, the distilled liquid is preserved in another container for standby; the medicine residues, humifuse euphorbia herb, goldhair hedyotis herb, camphor root and maple leaves are treated by water extraction for 2 to 3 times, 1 to 4 hours for each time, the water extraction liquid is concentrated to the relative density of 1.04 to 1.35 at 80 DEG C, the excipients are added, then drying and smashing are carried out, the distilled liquid of Chinese mosla herb is used for granulation or the clear paste is dried at low temperature to prepare the dry extract, then the smashing is carried out, the excipients are added, the distilled liquid is used for granulation and drying, the volatile oil of the Chinese mosla herb and the camphor or camp