The utility model relates to the technical field of insulating rod withstand voltage testing devices. The utility model relates to a testing device, in particular to a distance-adjustable insulating rod testing device. The hoisting device comprises a base, a connecting rod, a supporting rod, a fixed pulley block assembly, a movable pulley block assembly, a hoisting cable and a cable winch assembly, a cable winch assembly is fixedly installed at the left end of the base, a connecting rod inclining towards the upper right portion is fixedly installed at the position, on the right side of the cable winch assembly, of the base, and a supporting rod is fixedly connected between the middle of the connecting rod and the right end of the base. The device is reasonable and compact in structure; convenient use, through the cooperative use of the fixed installation plate, the movable installation plate, the first insulation support column, the second insulation support column, the first test clamp and the second test clamp, time and labor are saved when the test clamps are adjusted, the effective contact between the insulation rod and the test clamp is ensured, the labor intensity of operators is reduced, and the working efficiency is improved.