The utility model discloses a vibration damper for a power transmission line. The vibration damper comprises a transverse connecting piece and a pendant, wherein the outer ends of the transverse connecting piece are connected with hammer heads respectively, the transverse connecting piece and the hammer heads are made of insulation or semi-conduction materials, an inner cavity of the transverse connecting piece is filled with a rubber matter, and/or the outer layer of the transverse connecting piece is covered by a rubber layer. According to the vibration damper, the corona on the power transmission line can be effectively avoided, and the pendant can be prevented from being loosened to cause shifting.