The utility model relates to a lumbar vertebra pyramid fixation and fusion device which comprises a body 4 which is a vertebra table body made of fresh and health mammals bones; convex teeth 1 are respectively distributed at both vertebra surfaces of the body 4; more than two through holes 3 are arranged at both side planes of the body 4; a bar-shaped groove 2 is arranged at one end of each side plane facing to the upper bottom surface of the body 4. The fixation and fusion bone-knitting device made from bone materials has good mechanical strength, which can be used for supporting, fixing and fusing the rear pyramid of the lumbar vertebra pyramid. Especially, the utility model has the characteristics of no poison, no carcinogenicity and no allergic reaction and has good histocompatibility with human bodies. The utility model is very conveniently assembled with special tools, which is an ideal fixation and fusion device of L1 to S1 rear pyramid.