The invention discloses a hanging ladder for maintaining an electric transmission wire. The hanging ladder comprises hooks, hook ropes, hook disassembling ropes, a crossbeam and a sliding ladder rack; the quantity of the hooks is 2, the hooks are respectively hanged on the electric transmission wire, the hooks are respectively provided with the hook ropes and the hook disassembling ropes, one ends of the hook ropes are fixed to the hooks, the other ends of the hook ropes are fixed along the hook heads of the hooks and downward extend, one ends of the hook disassembling ropes are fixedly arranged at the upper portions of the hooks, and the other ends of the hook disassembling ropes downward extend; and the lower portions of the hooks are provided with connecting blocks, the connecting blocks are provided with transverse through holes, two ends of the crossbeam respectively traverse through the through holes and are provided with stopping parts, and the sliding ladder rack hangs on the crossbeam between the two hooks. The hanging ladder has the characteristics of realization of fast mounting and convenient dismounting without a crane, enlargement of the maintaining range of the electric transmission wire, guaranteeing of normal implementation of maintenance of the electric transmission wire, reduction of the maintaining cost, and improvement of the maintaining quality of the electric transmission wire.