The utility model provides a transmission stop device for high -voltage switch, including the driving medium, the one end of driving medium be arranged in with install be connected in the transmission of the crank arm shaft of turning arm box, the other end is used for splines with driving motor's motor output shaft plug -in type and is connected, the outside cover of driving medium is equipped with fixed cover, the one end of fixed cover is used for fixing at turning arm box or driving motor, is provided with the locating part on the outer peripheral face of driving medium, is provided with in the hole of fixed cover to cooperate the stop part with the rotation limit that restricts the driving medium with the locating part block. The beneficial effect of the utility model: when the drive motor drive driving medium is rotatory, the stop part can with the cooperation of locating part block, the rotation limit of restriction driving medium makes driving motor through positive and negative when conveying the divide -shut brake angle of setting for, the stop part effect down, guarantee that it can only be at limited corner internal motion, the striking that overshoots that prevent to overshoot, maloperation, electromagnetic interference etc. Arouses damages the inside explosion chamber of high -voltage switch, ensures high -voltage switch's safe operation.