The invention provides a transmission limiting apparatus. The transmission limiting apparatus comprises a transmission part; one end of the transmission part is in transmission connection with a connecting lever shaft mounted in a connecting lever box while the other end is in key connection with a motor output shaft of a driving motor; the exterior of the transmission part is sleeved with a fixed sleeve; one end of the fixed sleeve is fixed on the connecting lever box or the driving motor; a limiting part is arranged on the peripheral surface of the transmission part; and a stop part, matched with the limiting part in a stopping manner for limiting the rotation ultimate limit of the transmission part, is arranged in an inner hole of the fixed sleeve. The transmission limiting apparatus has the beneficial effects as follows: when the driving motor drives the transmission part to rotate, the stop part is matched with the limiting part in a stopping manner to limit the rotation ultimate limit of the transmission part, so that when the driving motor reaches set switch-off and switch-on angles through forward and backward rotation, it is ensured that the driving motor only can move within the limited rotary angle under the effect of the stop part, to prevent damage to an arc extinguish chamber in the high-voltage switch caused by overshoot impact due to overshoot, misoperation, electromagnetic interference and the like, so as to ensure the safe, stable and reliable operation of the high-voltage switch.