The invention discloses a spreader for oral and maxillofacial surgery, which includes a movable frame, a support frame and an adjustment box. The front of the adjustment box is provided with a scale line, and the inside of the adjustment box is movably installed with a two-way threaded screw rod. , the first thread kit is movably installed on the two-way threaded screw rod, the top of the limit seat is fixedly installed with a movable frame, the outer side of the movable frame is movably installed with a support frame, and the back of the movable frame is passed through a threaded rod An upper support base is movably installed, and a lower support base is movably installed on the bottom of the upper support base. In the present invention, a two-way threaded screw rod is movably installed inside the adjustment box, and the movable frame is driven to move relatively by rotating the two-way threaded screw rod, and the pointer can be used to cooperate with the scale line, so that the spacing of the opening can be grasped more conveniently. The lower support seat is installed in the activity, which can make the patient occlude on the upper support seat and the lower support seat, and it is not easy to fall off, which is convenient and quick.