The invention discloses a rapid machining process for an automobile mold. The rapid machining process comprises the steps that a mold is placed on the end face of a supporting seat, the supporting seat is pushed to the direction of a first pressing plate, and a rotating round tube is matched with a rotating shaft; the rotating shaft drives a first bevel gear to rotate, a second bevel gear is meshed with the first bevel gear, the second bevel gear drives a lead screw to rotate, and meanwhile, the lead screw moves to the direction of the first pressing plate along a strip-shaped through hole; and a threaded hole is matched with the lead screw to drive a sliding block to move towards the middle, two third pressing plates clamp the mold and a machining procedure is carried out. The invention discloses an automobile mold clamping tool and the steps of placing the automobile mold on the tool for machining, the device design is simple, operation is convenient, and the problem that an automobile mold cannot be stably fixed in the rapid machining process is solved.