The utility model discloses an insulating ladder which comprises a ladder body, a first binding band and a first fastener fixing end, wherein the first binding band is fixed on the left side of a first transom of the ladder body, and a first fastener is arranged at the head of the first binding band; and the first fastener fixing end is fixed on the right side of the first transom of the ladder body which is made of an insulating material. During use, the first transom is suspended on a service cap at the topmost end of a sleeve, the bottom end of the ladder body is placed in the appropriate position, a binding post of the sleeve is wound with the first binding band, the first fastener is connected with the first fastener fixing end, the ladder is fixed on the sleeve by the first binding band, and an operator climbs up and down through the ladder body. According to the insulating ladder provided by the utility model, the risk that the operator is injured when the ladder slips off is eliminated; the main acting force on the sleeve by the operator during use is on the service cap and is downward, only less lateral stress is required, the probability that equipment is damaged by larger lateral stress produced by a conventional insulating ladder on the wall of the sleeve is avoided, and accordingly, the safety is improved.