A fixing device for repairing a broken wall of a spinal pedicle comprises an expansion fixing sleeve and a head film sleeve, wherein the head film sleeve is used for sealing the head of the expansion fixing sleeve; a pedicle screw comprises a pedicle screw fixing threaded section and a pedicle screw fixing seat; the pedicle screw fixing seat is provided with a pedicle screw fixing seat threaded hole and a pedicle screw fixing seat connecting slot; the pedicle screw fixing seat threaded hole is provided with a countersunk head fixing nut; the expansion fixing sleeve is provided with an eccentric threaded hole; the pedicle screw fixing threaded section is matched with the eccentric threaded hole; the expansion fixing sleeve comprises a expansion fixing sleeve body, a first expansion plate and a second expansion plate; the first expansion plate and the second expansion plate are arranged on the head of the expansion fixing sleeve body; a broken wall repairing block which is projected outwards is arranged on a side part of the expansion fixing sleeve, therefore, the expansion fixing sleeve is firmly fixed on a spine; the pedicle screw is mounted firmly; and the circumstance that the expansion fixing sleeve cannot be fixed firmly due to loosening of the pedicle screw is avoided.