The invention provides an overhead line bird repelling device and a bird repeller, and belongs to the field of bird repellers. The device comprises a supporting rod, a rotary rack and a support connecting seat, wherein a reflector is arranged on the rotary rack; the support connecting seat comprises a clamping seat, a first clamping part and a second clamping part; the first clamping part and thesecond clamping part are arranged on one side of the clamping seat side by side; and a steel angle comprises two long parts which vertical to each other to form a right angle, one long part can be clamped between the first clamping part and the second clamping part, and the other long part can be clamped between a first baffle and the end part of the second clamping part. The bird repeller is a semi-spherical reflector. The overhead line bird repelling device can be stably fixed on the steel angle of a transmission line tower by utilizing the first clamping part and the second clamping part, cannot be easily broken when wind power is relatively heavy, and can constantly achieve the effect of bird repelling. The bird repeller can be used for reducing resistance while rotating, and can be firmly arranged on the transmission line tower.