The invention discloses a medicine for preventing and curing forestomach atony of ruminants, being prepared with the medicines according to a certain proportion: (fried) nuxvomica, areca seed, pharbitidis seed, euphorbia root, medicated leaven, hawthorn fruit, malt, Chinese rhubarb, mirabilite, stertite, antimony potassium tartrate and sodium bicarbonate, which (except mirabilite and stertite) are sun-dried, purified, crushed, and then grinded with two western medicines, sieved through an 80 to 100-mesh screen and finally mixed evenly. In clinical practice, the medicines are socked in boiled water for 30-60 minutes, of which the effective ingredients are dissolved and precipitated for improving the absorption rate of the medicine which is one-time drenched when cool. The medicine of the invention has quicker efficacy and smaller dosage compared with the single use of traditional Chinese medicine, longer maintenance time of drug effect and more difficult recurring compared with the single use of western medicine, and is difficult to develop the immunity to drugs, effectively releases or eliminates in vivo metabolic acidosis, greatly reduces death rate without a untoward reaction and with higher clinic cure rate. With simple preparation method and convenient use, the invention can be widely used in the breeding industry.