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The wire removal construction robot is a wire climbing robot, which is hung along the overhead line to complete the laying of cableway cables instead of workers. Aim at the needs of wire climbing of wire removal construction robot on overhead line with certain vertical radian, the wire climbing mechanism is analyzed and designed, and a four-wheel wire climbing mechanism is proposed. The mechanism uses the jacking device and tensioning wheel to provide additional pressure to meet the friction required by the stripping construction robot when climbing. Then, the stress of the robot when climbing is analyzed, and the conditions and calculation formulas of the pressure provided by the jacking device are given. Based on the proposed mechanism, the type selection calculation and demonstration of the jacking device of the construction robot are carried out. The practical application shows that the design in this paper can meet the practical needs.