The invention relates to the technical field of water gathering of power transmission circuits and provides a laser bird repelling device. The device comprises a pair of hanging racks which are front-back arranged. A host is arranged between the hanging racks. Slide ways are arranged on front and back ends of the host. A charging cell, a driving motor and a rotation shaft are arranged in the host.An n-type support is installed on the top of the host. The driving motor drives the n-type support to carrying out pitching rotation. Two oppositely arranged laser assemblies are fixed on the n-typesupport. Each laser assembly is divided into two layers, wherein a laser is arranged on one layer and a sweeping and swinging reflection mirror is arranged on the other layer. According to the invention, the laser bird repelling device is hung between two power transmission circuits and is capable of quite stably sliding along the power transmission lines; the hung racks can be adaptively telescopic according to the distance between the power transmission circuits, so the laser bird repelling device is widely usable; and in addition, the n-type support which is capable of carrying out pitchingrotation is arranged on the host, and two groups of laser assemblies are arranged on the n-type support, so two laser beams are irrelevant, and highly random, thereby facilitating bird repelling.