An oral positioning device for positioning a breathing tube includes a first teeth guard having a first groove, and a first seat extends from the first teeth guard. The first seat has a first notch. An engaging member has two pivots and a second seat which is engaged with the first seat. The second seat has a second notch which is cooperated with the first notch to form a positioning hole which the breathing tube extends. A second teeth guard has a second groove and two pivotal holes with which the two pivots are pivotably engaged. The first and second seats position the breathing tube in the patients mouth. The first and second teeth guards protect the patients teeth from being damaged by of the laryngoscope when opening the patients mouth.
