The utility model relates to a monospar electric power tower's tower anti -bird device, the semicylinder cutting ferrule of making including the plastic material, the semicylinder cutting ferrule clamps on the power pole body of the single cross arm beam top fixed by the installation band iron, and it is fixed through the metal clamp, the cyclic annular sphere that has outwardly strutting in the lower part edge of a semicylinder cutting ferrule system, two sections of cyclic annular sphere are by the separation blade shutoff of the same material, there be the inclined plane of cover in single cross arm beam top in the both sides of a cyclic annular sphere system, the lateral part opening on inclined plane flushes with two sections of cyclic annular sphere, the lateral part opening is by the rectangle separation blade shutoff of the same material. The utility model discloses prevent birds nest on the shaft tower to it because of the failure interruption that the bird's nest caused, has promoted and has joined in marriage net safety and service reliability to solve distribution overhead line.