The invention relates to the technical field of traditional Chinese medicines, in particular to a medicament for treating headache, which is prepared from Chinese herbal medicine as raw materials. The medicament for treating headache, disclosed by the invention, is characterized by being prepared from the following medicinal raw materials in parts by weight: 10 to 20 parts of paniculate swallowwort root, 10 to 20 parts of milkwort root, 10 to 20 parts of notopterygium, 10 to 20 parts of coix seed, 10 to 20 parts of motherwort, 5 to 10 parts of spina date seed, 5 to 10 parts of aloe, 5 to 10 parts of honeysuckle and 5 to 10 parts of bezoar. A method for preparing the medicament disclosed by the invention comprises the steps of: weighing and mixing the medicinal raw materials; adding water which is 5 to 7 times the weight of the medicinal raw materials and soaking for 30 to 40 minutes; heating and decocting the soaked medicinal raw materials for 40 to 50 minutes; filtering the decoction; adding water which is 4 to 5 times the weight of filter residues and decocting for 30 to 40 minutes; filtering the decoction; merging the filtrates; and condensing the filtrates to relative density of 1.4. The medicament for treating headache is administered through the nasal cavity. The medicament disclosed by the invention has the advantages of weak medicinal odour, simpleness and convenience for preparation, low price, fine curative effect and rapid effect.