The invention discloses a Chinese medicinal preparation and a method for preparing the Chinese medicinal preparation and particularly discloses a medicament for treating migraine and a method for preparing the medicament. The medicament is mainly prepared from the following raw materials in parts by weight: 8-10 parts of bupleurum, 10-12 parts of notopterygium, 6-8 parts of angelic, 4-5 parts of monkshood, 3-4 parts of radix aconiti agrestis, 10-12 parts of gastrodia elata, 10-12 parts of white chrysanthemum and 10-12 parts of poria. The formula of the adopted Chinese medicinal herbs is simple, the raw materials are easy to obtain and have relatively low cost, and the Chinese medicinal preparation has a definite treatment effect, can achieve a cure rate of 95% and is a novel medicament for treating migraine at present.