Assembly type automatic change-over switch

The utility model relates to the technical field of electrical switches, in particular to an assembly type automatic change-over switch, which comprises a switcher and two auxiliary devices, a controller is arranged on one side of the switcher, the auxiliary devices are arranged on the surface of the controller, and each auxiliary device comprises a first clamping block, a second clamping block and a third clamping block. The first clamping block is fixedly connected with the surface of one side of the controller, the surface of the first clamping block is fixedly connected with two sliding rods, the surfaces of the sliding rods are connected with a second clamping block in a sliding mode, a sliding hole is formed in the inner wall of the second clamping block, a limiting rod is connected with the inner wall of the sliding hole in a sliding mode, a clamping hole is formed in the surface of the first clamping block, and the limiting rod is connected with the inner wall of the clamping hole in a clamping mode.