The invention relates to a climbing extension ladder for an ice-coated power pole. A beam of an extension ladder body is provided with a power pole fastening device, wherein the power pole fastening device comprises a support body and a belt body; the support body is fixed on the beam; one end of the belt body is fixed on the support body and the other end is movably connected with the other side of the support body; a locating device, a traction device, a battery, a controller, a wireless receiver and an anti-unthreading safety device are arranged in the support body; the battery is connected with the controller and the traction device separately; the belt body is drawn by the traction device to slide; and the belt body passes through a gap between the locating device and the traction device and slides out of the support body through a locating plate. The climbing extension ladder for the ice-coated power pole is synchronously fixed on the extension ladder; the overall belt body is in a sawtooth form and is clamped through cooperation with a gear; and the stability performance is extremely good. Meanwhile, a fixed gear on the belt body can be matched with the gear on the support body, so that the fixing effect of a synchronous belt is improved. Furthermore, the elasticity of the synchronous belt can be regulated and controlled through a remote controller; and use is safe and convenient.