The invention provides a high voltage isolation switch overhaul platform. A fixed clamping fastener 4 and a movable clamping fastener 5 are connected with support rack box iron pieces of a high voltage isolation switch in a clamping manner, the fixed clamping fastener 4 is used for clamping one support rack box iron piece, and a lead screw 3 is screwed; because the lead screw 3 is connected with the movable clamping fastener 5 in a threaded manner and rotation of the movable clamping fastener 5 relative to a platform framework is limited via a limiting structure 11 of the platform framework, the movable clamping fastener 5 can move along an axial direction of the lead screw 3 when the lead screw 3 rotates, the movable clamping fastener 5 is then enabled to clamp the other support rack box iron piece, the platform is reliably connected with the support rack box iron pieces, a footboard provides a large standing area for maintenance workers, and a work safe factor can be improved when the maintenance workers do overhauling work on the high voltage isolation switch.