The present invention belongs to the technical field of electric lifting machine and live line operation and particularly relates to a transmission line unmanned aerial vehicle and electric lifting device combined live working method. An unmanned aerial vehicle is used to suspend an insulation rope to a conductive wire, a semi-static rope is dragged through the insulation rope to suspend the semi-static rope to the conductive wire, an equipotential electrician operates a small fly people machine to enter a strong electric field and reach a live line to carry out defective elimination operation. The method comprises the steps of setting the unmanned aerial vehicle and the insulation rope, checking the unmanned aerial vehicle, throwing the rope through the unmanned aerial vehicle, dragging the semi-static rope, installing the semi-static rope, installing the small fly people machine and a buffer self-locking device, carrying out equipotential electrician checking and connection, lifting the equipotential electrician by the small fly people machine and completing potential transfer, hanging a hard insulation ladder head and carrying out translocation, entering into equipotential to hang an extension rope to eliminate a defect, and exiting the equipotential. An operator is lifting by using the small fly people machine to reach a live line defective position, climbing an iron tower and a soft ladder to enter and leave the strong electric field is not needed, the safety risk is small, the working efficiency is high, and the operation is simple.