Mouth cavity positioning distraction device

The invention relates to a medical apparatus for a maxillofacial surgical operation, in particular to a mouth cavity positioning distraction device. The mouth cavity positioning distraction device comprises a lower distraction part corresponding to the lower jaw incisura of a human body and an upper distraction part corresponding to the lower jaw incisura of the human body and matched with the zygomatic arch, a lower front supporting rod and a lower rear supporting rod are respectively hinged to the two ends of the lower distraction part, and an upper front supporting rod and an upper rear supporting rod are respectively hinged to the two ends of the upper distraction part. The upper end of the lower front supporting rod and the lower end of the upper front supporting rod are hinged to a front hinge shaft, the upper end of the lower rear supporting rod and the lower end of the upper rear supporting rod are hinged to a rear hinge shaft, and the front hinge shaft and the rear hinge shaft are both installed on a middle shaft. The mouth cavity positioning distraction device is compact in structure, convenient to use and reasonable in stress, enables the suffering of a patient to be small, does not easily produce the situation of mechanical deformation or breakage in use and can adapt to different individuals.