The invention discloses a wire repairing system and method for hot-line work of a transformer substation. The wire repairing system comprises a shell; a driving mechanism is arranged in the shell; thedriving mechanism is connected with a left clamping arm and a right clamping arm separately to drive the left clamping arm and the right clamping arm to realize opening and closing movement; a base used for fixing a repairing piece is arranged between the left clamping arm and the right clamping arm in a direction perpendicular to the movement direction of the clamping arms; and wire combining devices are arranged at the two ends of the base respectively. The wire repairing system has the beneficial effects that the mechanical arms are used for clamping the wire repairing devices for conducting wire repairing operation, so that characteristics of high mechanical degree, high automatic degree and the like are achieved, the requirement for crimping of wires in the transformer substation ismet, and the operation safety of an operator is guaranteed. By virtue of the device, the working intensity of manual operation can be effectively lowered, and the crimping efficiency and the automation level are improved, so that a positive change effect is generated on the wire crimping and repairing operation mode of the transformer substation in China.