The utility model provides a telescopic high voltage insulation test device, relates to a test device. At the actual motion in -process, the operation of ascending a height is had relatively high expectations to operating personnel's specialty, during the operating cost, and has great potential safety hazard. The utility model discloses a clamping head, action bars, the clamping head is scalable action bars including fixed chuck, moving chuck and control mechanism, action bars, and fixed chuck includes fixing base, first red copper clamp, and moving chuck presss from both sides including removal seat, second red copper. This technical scheme presss from both sides tight wire through purple copper chuck, and is with terminal connection's wire switch -on, electrically conductive effectual, the telescopic action bars is convenient for test the eminence wire, avoids operating personnel's the operation of ascending a height, and mouthful occlusal surface that presss from both sides of arc sawtooth ensures that the interlock is firm, can the dismantlement mode being convenient for to change not the red copper of equidimension cambered surface according to the diameter of the centre gripping wire of difference and pressing from both sides, realize great clamping face, the electric flux effect is better, tests sensitivelyer.