A covering device for oral and maxillofacial emergency surgery. The invention relates to the technical field of medical auxiliary equipment for oral surgery. An operating window is provided on the mask, and chutes are symmetrically fixed on the left and right sides of the operating window, and the operating window is movable and pierced. There is an opening fixing sleeve, a guide ring is fixedly arranged on the lower inner wall of the opening fixing sleeve, a screw rod is movable through the guide ring, and a tongue depressor is fixedly installed at the rear end of the screw rod, and the upper surface and rear end of the tongue depressor are fixed There is a support collection bucket; the left and right sides of the mask are provided with gill guards through the No. 1 connecting piece, and the neck guard is set under the mask; it connects the mouth opener part with the mask part, and then fixes the patient's mouth When the doctor is operating, the position of the mask can be limited, even if the doctor touches the mask frequently, the position of the mask will not be changed, thereby ensuring that the mask can normally cover the patient's face.