The invention discloses a line anti-vibration hammer capable of adjusting resonant frequencies, relates to a line anti-vibration hammer, and aims at solving the problems that the existing antivibrator only can be matched with several resonant frequencies, and a resonance vibration attenuation effect cannot be exerted on other numerous frequencies. A line sheath of the line anti-vibration hammer disclosed by the invention covers a lead; a clip assembly is arranged on the line sheath; a middle support plate is connected with the lower end of the clip assembly through bolts; a bottom support plate is arranged at the lower end of the middle support plate; a stepping motor is arranged on the bottom support plate through a pressing plate; the output end of the stepping motor is connected with a screw; two ends of the screw are respectively supported by a first rotating part and a second rotating part and are rotatably connected; a worm wheel is arranged on the bottom support plate above the screw; the middle part of a rotating lever is rotatably arranged on the middle support plate; two ends of the rotating lever are respectively and rotatably connected with one end of a first connecting rod and one end of a second connecting rod; the other end of the first connecting rod and the other end of the second connecting rod are respectively and rotatably connected with a resonant device. The line anti-vibration hammer disclosed by the invention is used for resonant frequency adjustment of an overhead line.