Method for replacing cotter pin on power transmission line

The invention relates to a method for replacing a cotter pin on a power transmission line. The method comprises the following steps that an unmanned aerial vehicle is used for conveying a cotter pin replacing robot to the power transmission line; the walking mechanism is clamped on the power transmission line and walks to the position of the cotter pin to be replaced; the positioning mechanism clamps the part for positioning; the dismounting mechanism corresponds to the head part of the cotter pin; the clamping assembly is used for clamping the cotter pin to be replaced; the clamping assembly is pulled to move in the direction away from the positioning mechanism, and meanwhile the flattening assembly is made to move in the direction close to the positioning mechanism; the disassembled cotter pin is placed in the storage mechanism; a new cotter pin is taken out from the storage mechanism through the disassembling and assembling mechanism, and the new cotter pin is inserted into a pin hole of the component; and