The invention relates to an operating device for a disconnecting switch, and belongs to the field of electric switches. The problem that staff cannot rotate the disconnecting switch due to the fact that an operating handle of the outdoor disconnecting switch is corroded is solved. The operating device for the disconnecting switch comprises a clamping component and an operating handle connected to the clamping component, the clamping component comprises a threaded rod, a nut matched with the threaded rod, a lower clamping block, an upper clamping block and an anti-skid screw, the lower clamping block axially moves along the threaded rod, the upper clamping block axially moves along the threaded rod, the lower clamping block and the upper clamping block are spliced to form a clamping groove, one end of the anti-skid screw penetrates through the lower clamping block or the upper clamping block and extends into the clamping groove, and the nut rotates on the threaded rod to adjust the relative distance between the upper clamping block and the lower clamping block.