The present invention discloses a power transmission line foreign matter barrier eliminating pulley which belongs to the power grid field, and is used for solving the technical problem in the prior art that the pulley eliminates the foreign matters in a friction cutting manner, so that the efficiency is low, and the working strength is large. The power transmission line foreign matter barrier eliminating pulley of the present invention comprises a pulley body, and a traveling pulley for sliding on a power transmission line, a rotating rack, and a driver for driving the rotating rack to rotate are arranged on the pulley body. The rotating rack is equipped with a thermal cutting member used for fusing the foreign matters, and the pulley body is equipped with a power supply for supplying power to the thermal cutting member. The power transmission line foreign matter barrier eliminating pulley of the present invention is applied to the high voltage power transmission lines of a power grid.