The invention discloses a machining process of a door shaft of a civil defense door. The machining process comprises the following steps of, 1, placing a round steel raw material on a sawing machine,and sawing the raw material into a cylindrical workpiece; and 2, first stretching and machining by using a punch press to form a U-shaped workpiece, and the upper end surface of the workpiece is provided with an inner counterbore. The machining process of the door shaft of the civil defense door is high in efficiency, the environmental pollution is reduced, and the quality of the door shaft is improved.