The traditional repair method of broken strand wires is artificial aerial repair,which has high work intensity,high risk and low efficiency.Based on the analysis of the existing repair devices for broken strand,a transmission line broken strand rollback repair robot was proposed,which were driven along the overhead ground wire by the PLC control system,the broken strand of the transmission line was driven to rotate around the sleeve through the driving gear at the broken strand of the ground wire,and the broken strand wires were extruded back to the depressed part of the transmission line through the spring cylinder in the stroked back sleeve， and the broken strands were clawed back and crimped,so as to repair the broken strands.Finally,the experimental results show that the robot has stable and reliable ability to repair broken strand wires.