The utility model relate to a device for lead side fitting fastener of a live-line compensation power transmission line. The device is characterized by comprising an insulation operating lever (8); the insulation operating lever (8) is connected with one end of a transverse axis (3) of an L-type shaft; the transverse axis (3) of the L-type shaft is equipped with a branch pipe (2); the branch pipe (2) is in clearance fit with the transverse axis (3); the transverse axis (3) at two sides of the branch pipe (2) is respectively provided with a shaft shoulder (4) for spacing of the branch pipe (2); and the branch pipe (2) is connected with a sleeve (7) through a connecting rod (1). According to trial, the device provided by the utility model on the one hand avoids problems of small power delivery amount and reduced equipment reliability due to non-planed power failure caused by a traditional working mode of power failure defect elimination, and on the other hand avoids problems of large danger, a lot of working personnels and complex equipment of a traditional equipotential working mode.