The utility model relates to a large bending moment concrete electric pole ground wire support device. The device comprises a horizontal plate and a vertical plate, wherein the horizontal plate extends towards the left and right sides, and the vertical plate extends vertically. One side of the horizontal plate is provided with a connection structure used for fixed connection with a top cover or an electric pole or a steel ring of the electric pole. The other side of the horizontal plate is vertically provided with a vertical wire hole used for connecting a tension resistant pole ground wire support. The top end of the vertical plate is fixedly connected to the bottom surface of the horizontal plate. The end part of one side of the vertical plate is provided with an end surface fixedly connected to the steel ring of the electric pole. The surface at the other side of the vertical plate is provided with a transverse wire hole in the front and back direction. The beneficial effects are that the horizontal plate and the vertical plate are simple in structure, economical and convenient in machining, and suitable for a tension resistant pole and a straight pole. In the usage process, the horizontal plate can be used as a ground wire support plate of the tension resistant pole, the vertical plate can be used as a ground wire support plate of the straight pole. Thus, the device achieves multiple functions within one form.