The invention discloses a worm gear supporting structure of an automobile electric power diverter. The worm gear supporting structure comprises diverter output shafts, locknuts, bearings, a worm gear and a casing, wherein a left bearing and a right bearing are arranged on the diverter output shafts on two sides of the worm gear; a groove matched with a clamp spring 8 is formed in the wall of a bearing hole in the left end of the casing; a left end surface of the clamp spring is contacted with a right end surface of an outer ring of the left bearing; and the right bearing is mounted in a hole of a supporting plate at a right end hole of the casing. The worm gear supporting structure has remarkable advantages as follows: the stress is uniform, the deformation is little, and the occupied space is small.