Bird repeller

The invention provides a bird repeller which comprises a box body, wherein a sensing device and a fixed cylinder are arranged at the top plate of the box body, a placing cylinder for containing a birdrepelling agent is arranged in the fixed cylinder, a cylinder cover is arranged at the top of the placing cylinder, a bottom plate is arranged at the bottom of the placing cylinder, air vents are formed in the side all of the placing cylinder, the placing cylinder is in inserted matching with the fixed cylinder, a through hole is formed in the top plate, a driving device is arranged on the box body and comprise a piston rod, the piston rod passes through the through hole to be fixedly connected with the bottom plate of the placing cylinder, and the sensing device is electrically connected with the driving device; and a first splint and a second splint are arranged at the bottom of the box body to fix the bird reppeller. The bird repeller can repel birds by smell, birds can be sensed by the sensing device so as to