The invention relates to an operating mechanism of an automatic change-over switching device. The operating mechanism comprises a rotating plate, a rotating disc, connecting rods, driving shafts, springs and rotating arms, wherein the two driving shafts are respectively arranged at the outer ends of the two connecting rods in a penetrating manner, the outer ends of the two connecting rods are respectively connected with the outer ends of the two rotating arms, the inner ends of the two rotating arms are connected to a central shaft, the inner ends of the springs are connected with the outer ends of the connecting rods, the outer ends of the springs are fixed, two triangular holes are symmetrically formed in the rotating plate, the inner ends of the two connecting rods are respectively connected into the two triangular holes, a rotating plate column is arranged at the inner end of the connecting rod, the rotating plate column moves in the triangular hole, two arc-shaped driving groovesare formed in the rotating disc, and the two driving shafts penetrate through the two driving grooves respectively. According to the invention, a moving space is provided for the rotating plate columnof the connecting rod through the triangular hole, so that the rotating plate column can rapidly move in the triangular hole in the switching process so as to achieve the rapid skipping among all gears of the automatic change-over switch.