The invention relates to a fixing device used between vertebras, in particular to a memory alloy pressure fixing device used between spondyles; the fixing device of the invention comprises a fixed foot and a fixed connecting rod; the fixing device is provided with two fixing feet which are approximately symmetrical with the left part and the right part; the top end of the two fixed feet is connected with the fixed connecting rod; the fixed feet and the fixed connecting rod form an angle Alpha which is ranging from 60 DEG to 88 DEG; the bottom end of the fixed feet is provided with an upper sawtooth hook; the fixing device is made of memory alloy. The fixing device of the invention has simple structure and is easy to be prepared and executed; furthermore, the fixed feet can generate continuous pressure; therefore, the fixing device is firm and reliable and is not loosened, prompts the amalgamation of chine, shortens the treatment time and has wide application range.