The utility model discloses an integral conformation memory alloy section internal fixer in the shape of double wings. The utility model uses a material of conformation memory alloy; the integral conformation memory alloy section internal fixer is in an arced shape, wherein the middle section of the arc is downwards concave, two side sections protrude upwards to present the shape of double wings at both sides and two end heads are provided with hooks. The utility model is suitable for repairing lumbar spondylolysis, the stress point is the juncture of the spinous process fundus part and the transverse process root part, the superior articular process fundus part and the pedicle of vertebral arch, and three point stress is formed; simultaneously, the utility model has the action of cross extrusion so that the fixation is stabler, simultaneously, the utility model still more conforms to the anatomy of the lumbar spondylolysis and the requirement of biomechanics. The utility model has the advantages of small operation wound and easy operation.