The invention relates to a novel interspinous process fixing device. The novel interspinous process fixing device comprises an interspinous process fixator and a conveying device, wherein the interspinous process fixator comprises a flexible and foldable bag (100) and a filling material (200), the near end of the bag is provided with an injection hole (110), the conveying device comprises a conveying pipe (310), the injection hole (110) is in detachable connection with the far end of the conveying pipe (310), the filling material (200) is injected thorough the conveying pipe (310) and the injection hole (110) so as to spread the bag to form the interspinous process fixator, the part, positioned between two spinous processes, of the interspinous process fixator forms a support section, and the parts, positioned on the two sides of the spinous processes, of the interspinous process fixator protrude out, so that the movement of the interspinous process fixator between two spinous processes is limited. According to the novel interspinous process fixing device, through a minimally invasive method, the novel interspinous process fixing device is released after being conveyed between the spinous processes, then the filling material is injected, so that the fixation of the spinous processes is realized, and therefore, the micro-traumatic intervention treatment is realized, and the trauma to the patient is small.