Protective device used for steering transmission shaft of automobile

The utility model relates to a protective device used for a steering transmission shaft of an automobile. The protective device comprises a horn-shaped seal sleeve and a plastic press plate, wherein the seal sleeve is located in an automobile body partitioned by an automobile body front wallboard, can seal a via hole for the steering transmission shaft to pass through, and is arranged on the steering transmission shaft in a sleeving mode; the plastic press plate is used in cooperation with the seal sleeve and pressed on the seal sleeve in a stacked mode, and the plastic press plate is provided with a notch formed by cutting in the axial direction of the steering transmission shaft and provided with a fixing part used for fixing the plastic press plate on the automobile body front wallboard; the seal sleeve is provided with a fracture face formed by cutting in the axial direction of the steering transmission shaft, and the notch and the fracture face are installed in a staggered mode. An annular groove is formed in the outer surface of the matching position of the seal sleeve and the steering transmission shaft, and a hoop for arranging the steering transmission shaft in the annular groove in a sleeved and tucked mode is arranged in the annular groove to achieve a better seal effect. The protective device used for the steering transmission shaft has the advantages of being convenient to install and capable of effectively sealing the via hole.