An embodiment of the invention provides a pole tower of a power transmission line and relates to the field of power transmission. Corrosion of a pole tower main material caused by electrochemical action can be effectively inhibited to guarantee safe long-time running of the pole tower of the power transmission line. A specific scheme includes that a protection ring is mounted on at least one tower foot of the pole tower, one side of each protection ring is electrically connected with the corresponding tower foot while the other side of the same is grounded, and each protection ring is made of a metal material with activity higher than the tower foot main material. The pole tower is used for power transmission.