An interspinous process distraction device includes a curved plate which is formed with an upper plate and an opposite lower plate by bending a board material, with the upper plate being penetrated with two upper wire holes and the lower plate being penetrated with two lower wire holes an upper fixing wire, two ends of which penetrate from bottom to top the two upper wire holes of the upper plate to be tied on a spinous process and a lower fixing wire, two ends of which penetrate from top to bottom the two lower wire holes of the lower plate to be tied on the spinous process. This interspinous process distraction device is provided with a low manufacturing cost and high durability.
