The invention relates to a telescopic fishbone ladder for electric power overhaul. The telescopic fishbone ladder for electric power overhaul comprises a vertical supporting column and pedal rods on two sides of the supporting column, wherein the supporting column comprises a group of telescopic units which are successively mounted from outside to inside in a sleeving manner; a positioning mechanism is arranged between the inner and outer adjacent telescopic units; each telescopic unit comprises a sleeving rod and a storage rod parallelly and fixedly connected; the inner telescopic unit is located in the sleeving rod of the outer telescopic unit and forms sliding fit; a vertical storage tank opened outside is arranged on the side face of the storage rod; the pedal rods are located in the vertical storage tank and the bottoms of the pedal rods are hinged to the vertical storage tank; the bonefish ladder is also provided with a fixing mechanism for the telescopic units. The fixing mechanism comprises a fixing frame surrounding the telescopic units and a fastener fixedly connected to the fixing mechanism. The fishbone ladder is skillful in structure, convenient to carry, convenient tomount, firm to fix and suitable for occasions needing climbing, for example, electric power overhaul.