The utility model relates to the technical field of charged replacement of 220kV-flexible busbar static contacts, in particular to an insulation trestle ladder which comprises a ladder head and two ladder bodies formed by ladder columns and ladder steps. The insulation trestle ladder is characterized in that the length of each ladder column is 10.5-12.5m, a lead fixing arm is arranged on the ladder body on one side, and the distance between the lead fixing arm and the ladder head is 1.6-0.8m. Three distance control ropes are arranged between the two ladder bodies from top to bottom, two insulation traction ropes for preventing the waists of the ladder bodies from contracting are arranged outside each ladder body, and the insulation control ropes and the insulation traction ropes are respectively connected with ground anchors. Compared with the prior art, the insulation trestle ladder has the advantages of serving as an insulation man-carrying platform to meet requirements of an equipotential operation method, and being small in size, capable of lifting under a flexible busbar, and suitable for charged replacement operation of the 220kV-flexible busbar static contacts of single-column and double-column vertical opening type isolation switches in GW6 series.