The invention discloses a hook ladder for a high-tension cable. The hook ladder comprises a hook ladder body. The top area of the hook ladder body is provided with a hook assembly, the bottom area of the hook ladder body is provided with a supporting plate assembly, the hook ladder body is further provided with a voltage measuring device. By arranging the hook assembly at the top area of the hook ladder body, the hook ladder body can be suspended over an insulator cross arm. By arranging the supporting plate assembly at the bottom area of the hook ladder body, the hook ladder body can be supported above a wire. Through the hook ladder, workers can replace an insulator suspended on a 220 KV line and a 110 KV line very conveniently, manpower and material resource investment is reduced, and the insulator replacement efficiency is improved.