The invention provides a UHV DC transmission line strain tower electrified processing hardware fitting fall-off field operation process, which comprises the steps of: 1) a ladder head-flexible ladder system is lifted; 2) a ladder head and a flexible ladder of the ladder head-flexible ladder system are connected by a ground potential electrician; 3) the ground potential electrician hangs the ladder head on a ground wire, and removes a ground wire shockproof hammer on the ground wire; 4) an equipotential electrician hooks a transmission rope on a safety belt; 5) the equipotential electrician applies to enter equipotential; 6) the equipotential electrician arrives at a connecting hardware fitting disconnected position along a current leading wire, and detaches the connecting hardware fittings; 7) the equipotential electrician exits equipotential after the defects are completely eliminated; 8) the ground potential electrician cooperates with an electrician on the ground to transmit the ladder head-flexible ladder system to the ground; and 9) the equipotential electrician goes down the tower after completing operation. The UHV DC transmission line strain tower electrified processing hardware fitting fall-off field operation process is convenient in operation, is high in safety, has universality, is suitable for defect eliminating operation of entering and exiting equipotential of a strain tower on a UHV DC transmission line, and has good popularization and application value.