The invention relates to the technical field of distribution network operation and maintenance equipment, in particular to a high-safety puncture clamp tightening device suitable for live working robots, which includes four tightening shafts, a motor and a gear box, and the motor is connected to the tightening shaft through the gear box One end is driven and connected, and the other end of the tightening shaft is set on the clamp screw of the puncture clamp; the gearbox includes a box body, two sets of driving gears, four tightening gears, a driving gear, a driving shaft and a reversing gear, and the driving gear includes a main gear , auxiliary gear, gear shaft and one-way transmission device, the main gear is connected to the gear shaft through the one-way transmission device, the auxiliary gear is fixedly connected to the gear shaft, the driving gear is connected to the motor, one group of main gears meshes with the driving gear, and the other The main gear of the group meshes with the reversing gear, and the reversing gear meshes with the driving gear. The substantive effect of the present invention is: when the motor is in the forward and reverse direction, one puncture wire clip is tightened respectively, so that the puncture wire clip can be tightened more reliably, and the reliability and safety of the branch line are improved.