The utility model discloses a special climbing ladder for 110kV composite insulators. The climbing ladder comprises two ladder bars and a ladder body which is composed of a plurality of ladder pedals and made of an insulating material. An upper end of the ladder body is provided with a clamping device for clamping a ball head ring fitting at an upper end of the insulator. The clamping device comprises a fixed clamp fixedly connected on outer sides of the end parts of the two ladder bars via yoke plates. One yoke plate at one end of the fixed clamp is hinged to a movable clamp buckled to the fixed clamp. An upper end surface, which is opposite to a hinged end, of the movable clamp is provided with a pin hole. The yoke plate relative to an end, where the pin hole is disposed, of the movable clamp, is provided with a corresponding through hole. A pin column corresponding to the pin hole is connected onto the fixed clamp or the movable clamp via a hinge. The center of a buckle position between the fixed clamp and the movable clamp is provided with a clamping hole corresponding to the ball head ring fitting. The special climbing ladder has the advantages of strong universality, reasonable structure, good safety, good reliability, carrying convenience and disassembling convenience.