The invention belongs to the field of a high-voltage switchgear and relates to a load switch auxiliary switch grounding driving mechanism. The driving mechanism comprises a linkage crank arm driven by a load switch main shaft. The outer end of the linkage crank arm is provided with a guide pin; the guide pin is arranged in a guide groove in the front section of a lever and can slide along the guide groove; the middle portion of the lever is hinged to a fixed pivot shaft; the back end of the lever is hinged to a grounding auxiliary switch pull rod; and the grounding auxiliary switch pull rod can swing with the lever and drives a grounding auxiliary switch to be switched on or off. The front section of the guide groove is an arc section, and the travel track of the guide pin moving from a closed position to an opening position of a load switch with the linkage crank arm is overlapped with the arc section; and the back section of the guide groove is a line section extending backwards and downwards along the tangential direction of the arc section. The lever and guide groove shape are arranged in an optimization manner, so that in the load switch grounding process, transmission resistance to the grounding auxiliary switch is small, and transmission reliability is improved.