The invention relates to a medicinal composition for treating secondary trigeminal neuralgia. The medicinal composition is prepared from the following crude drugs: scorpion, carapax et plastrum testudinis, semen cassiae, calculus bovis, bear gall, rhizoma corydalis, sangusis draconis, rhizoma sparganii, rhizoma acori graminei, radix adenophorae, nardostachyos root and rhizome, bulbus fritillariae cirrhosae, rhizoma polygonati odorati, fructus viticis, cortex cinnamomi, marsdenia longipes, semen cuscutae and sea horse, wherein monarch drugs comprise the scorpion, the carapax et plastrum testudinis and the semen cassiae; ministerial drugs comprise the rhizoma corydalis, the sangusis draconis, the calculus bovis and the bear gall; adjuvant drugs comprise the radix adenophorae, the nardostachyos root and rhizome, the bulbus fritillariae cirrhosae and the rhizoma polygonati odorati; conductant drugs comprise the fructus viticis, the cortex cinnamomi, the marsdenia longipes, the semen cuscutae and the sea horse. According to the medicinal composition disclosed by the invention, all the drugs are mutually coordinated while realizing respective effectiveness; all the components are compounded together to achieve unexpected technical effects in the aspect of treating the secondary trigeminal neuralgia; the medicinal composition has the advantages of rapid effect, high efficiency, short treatment course, low possibility of recurrence and the like; besides, a unique four-phase separation process is easy to grasp, apply and promote.