The invention discloses a medicinal composition for treating children with tic disorders and a preparation method thereof, aiming at solving the problem on treating the children with tic disorders. The medicinal composition is characterized by comprising the following raw medicinal materials in weight proportion: 10-30 parts of prepared rehmannia root, 6-12 parts of common macrocarpium fruit, 3-10 parts of pinellia tuber, 6-12 parts of bamboo shavings, 3-10 parts of fruit of immature citron, 6-12 parts of common yam rhizome, 6-12 parts of tangerine peel, 6-12 parts of oriental waterplantain rhizome, 6-12 parts of moutan bark, 9-15 parts of poria cocos, 3-10 parts of prepared licorice, 15-30 parts of drgon's bones, 15-30 parts of oyster, 6-15 parts of earthworm, 5-9 parts of stiff silkworm, 6-12 parts of uncaria, 6-12 parts of cicada slough, 3-9 parts of grassleaf sweelflag rhizome, and 10-25 parts of nacre. Clinical experiments prove that the medicinal composition has the characteristics of good curative effect and higher safety for treating the children with tic disorders and is worthy of clinical application and popularization.