The utility model relates to a special tool for a live-line reset split pin of a power transmission line and belongs to the technical field of special tools for split pins. According to the technicalscheme, a reset hammer head (1) is arranged at the head of a reset hammer body (12), and the tail of the reset hammer body is bent downwards and provided with a pin folding hole (2); a first connector(10) is arranged below a hammer body (12) of the reset hammer, an inverted-U-shaped groove (4) is formed in the lower side face of the first connector, and a plurality of tooth grooves (3) are evenlyformed in the end face of the first connector in the circumferential direction. The end part of the insulating rod (8) is provided with a connector II (11), the middle part is provided with a fixed threaded hole (6), and the end surface of the connector II is uniformly provided with a plurality of bulges (5) along the circumferential direction; the tooth grooves are matched with the protrusions,and the first connector and the second connector are connected through a connecting bolt (9). According to the utility model, the cotter pin can be reset and folded under the electrified condition, the operation is simple, the use is convenient, the performance is reliable, the time and labor are saved, and the economic loss is reduced.