The utility model relates to an operating apparatus for an isolating switch which belongs to the technical field of electrical switch. The apparatus is introduced with the object of solving the problem that the operating handle of an open air isolating switch could go so rust that an operator might fail to turn the isolating switch on. The operating apparatus comprises a clamping assembly and an operating handle that is connected with the clamping assembly. The clamping assembly further comprises a screw thread rod, a nut cooperatively functioning with the screw thread rod, a lower clamping block moving along with the screw thread rod, an upper clamping block moving along with the screw thread rod, and an anti-sliding screw. The said lower clamping block and the upper clamping bock are combined to form a clamping groove. One end of the anti-sliding screw penetrates the extension parts of the lower clamping block and the upper clamping block into the clamping groove. The nut adjusts the distance between the upper clamping block and the lower clamping block by rotating on the screw thread rod.