The invention relates to a high-voltage grounding switch, which comprises a shell, moving contacts, and electric connection sleeves which pass through the lateral surface of the shell, wherein the moving contacts are respectively inserted into the corresponding electric connection sleeves; one end, which extends into the shell, of each electric connection sleeve is in conductive connection with aconductive connection plate respectively; one end, which is far away from the electric connection sleeve, of the conductive connection plate is connected on a corresponding conductive connection block; and conductive connection blocks are respectively arranged in through holes of insulators of which the centers are provided with the through holes; and the insulators are arranged on the shell. In the high-voltage grounding switch, the electric connection relation is changed by the three insulators without central conductors, so the problem that products cannot run normally due to air leakage caused by easy cracking of the insulators is solved completely.