The invention relates to a traditional Chinese medicinal formula for treating acute enteritis by oral administration. Acute enteritis often occurs in hot summer and autumn. In Western medicine, anti-inflammatory and antibacterial drugs are used for treatment of acute enteritis, but sometimes, intestinal beneficial bacterial colonies are severely killed, causing intestinal dysfunction and conversion from acute enteritis to chronic enteritis. The traditional Chinese medicinal preparation has effects of removing dampness by diuresis, clearing away heat, and invigorating spleen and stomach, and has good drug effect, low toxic and adverse effects, no drug resistance and the like. The traditional Chinese medicinal preparation comprises the following ingredients in parts by weight: 8-12 parts of Scutellaria baicalensis, 8-12 parts of Rhizoma Atractylodis (Atractylodes lancea and/or Atractylodes chinensis), 6-14 parts of Radix Puerariae (Pueraria lobata and/or Pueraria thomsonii), 5-15 parts of Nelumbo nucifera leaf, 8-12 parts of Aucklandia lappa, Pogostemon cablin, 10-20 parts of parched Dolichos lablab seed, 2-4 parts of Rhizoma Coptidis, 8-10 parts of Magnolia officinalis, 2-4 parts of processed Radix Glycyrrhizae, 9-15 parts of Angelica dahurica, 8-12 parts of Alisma orientalis, 10-20 parts of Perilla frutescens leaf, and 12-18 parts of parched Massa Medicata Fermentata. The traditional Chinese medicinal preparation has effects of clearing the bowels, relieving diarrhea, and relieving exterior and interior syndromes, and has good therapeutic effect on acute enteritis, bacillary dysentery, ileotyphus, gastrointestinal type cold and other diseases due to non-relief of exterior syndrome and intense heat. The traditional Chinese medicinal preparation takes action after 2 days of administration, and patients are clinically recovered after 3-4 days.