An anti-corrosion grounding device for an electric transmission line tower is of a closed loop shape or a polygonal shape composed of a grounding body, a linear connector and a T-shaped connector. A port of the T-shaped connector in the perpendicular direction is connected with a grounding lead connecting board through a downlead of the grounding body. The grounding body, the linear connector and the T-shaped connector are connected in a pressed mode through hydraulic pressure so that the grounding body, the linear connector and the T-shaped connector can be tightly connected. The grounding body of the grounding device is made of carbon steel coated with stainless steel. According to the anti-corrosion grounding device for the electric transmission line tower, the connecting portions are flat, smooth and even, connection is reliable, the contact performance and the sealing performance are good, and corrosion can be slowed down.