The invention discloses a retractable insulating ladder for overhaul at high altitude. The ladder comprises four retractable single rods which are connected to form a square retractable ladder through transverse rods, wherein each rod body of each retractable single rod is provided with the transverse rod, a fixed sleeve is arranged at each connection of each transverse rod and the corresponding retractable single rod, and each retractable single rod is respectively provided with an inclined supporting rod. The four retractable single rods are prepared from a glass fiber reinforced plastic fiber material. Each transverse rod is provided with a tool disc which is provided with a fixing mechanism capable of placing and fixing maintenance tools. The ladder disclosed by the invention takes a glass fiber reinforced plastic fiber material as a basic raw material which has the advantages of light weight, tenacity and firmness and good insulating effect compared with those of primarily used resin tubes. The ladder is adopted, so that the labor intensity is reduced, the operating time is shortened, and the safety coefficient of field operation at the high altitude is improved.