The invention relates to an insulating bracket for high-voltage tests, comprising a base, wherein the base is provided with a fixing slot and is connected with a telescopic rod through the fixing slot, the top end of the telescopic rod is provided with a connecting member, the connecting member is connected with a support rod, the support rod and the telescopic rod are connected by an adjusting rod, the upper end of the telescopic rod is provided with a sliding groove, the adjusting rod is connected with the sliding groove on the upper end of the telescopic rod through an adjusting bolt, the support rod and the telescopic rod are adjusted by the adjusting rod to be in angled connection; the end of the support rod is provided with a clip, the telescopic rod comprises an inner tube and an outer tube, the inner tube is inserted into the outer tube and is telescopically connected with the outer tube; a wiring adapter board is fixed to the outer tube, four groups of binding posts are arranged on the wiring adapter board, and each group of binding post includes four connecting wires; each connecting wire includes one active wiring terminal and one tested wiring terminal; the active wiring terminal is connected to the tested wiring terminal via a knife switch.