The invention relates to the technical field of medical instruments and discloses a spinous fixator comprising two spinous fixator bodies in J shapes and reversely fastened; each spinous fixator body is composed of a transverse side and a vertical side, one top end of the transverse side is provided with an adjusting hole, the other top end thereof is provided with a fixing hole, and the vertical side is provided with at least two fixing holes. During usage, the spinous process occluded is placed at the pedicle of a patient and is positioned with the transverse sides of the spinous fixator bodies, tightness of the spinous process is adjusted well through the adjusting holes, the vertical sides of the spinous fixator bodies are fixed to two sides of the spine, respectively, after a screw is mounted, and the spinous process occluded can be safely and reliably fixed to the spine; after the surgery, problems such as displacement and shedding rarely occur, the reliability is high, and the patient with spinal cord and spinal diseases feels less pain; the spinous fixator is simple in structure, convenient to operate, highly reliable and reusable and helps reduce economic burden of the patient.