The invention provides a technology for electrified overhaul of +-500kV double-circuit direct-current power transmission lines on the same tower. The operation method entering equal potential comprises the following steps that an equal potential worker and a ground potential worker carry an insulated conveying rope to climb the tower to a ground wire support to tie a safety belt, and install an insulation pulley and the insulated conveying rope on the ground wire support for operation; ground workers pass an insulated soft ladder and insulated soft ladder hangers to the position of the ground potential worker; the ground potential worker dismounts a damper of an overhead ground wire at the working side, and installs the soft ladder hangers on the overhead ground wire reliably; after the equal potential worker checks that all the parts of shield clothes are connected well, the equal potential worker ties an insulated protecting rope, goes to the insulated soft ladder to stand and tie the safety belt on the insulated soft ladder; the ground workers use tail ropes of the insulated soft ladder for swinging the insulated soft ladder and when the distance between the equal potential worker and electrified conducting wires is about 0.5 m, the equal potential worker quickly grabs the conductive wires and carries out potential transfer. The technology for electrified overhaul of the +-500kV double-circuit direct-current power transmission lines on the same tower fills the gaps in domestic and foreign ultra-high direct-current electrified overhaul technology.