A bird repellent system comprising an electronic device (1) alternating electrical pulse generator that is electrically connected to a mesh (2) formed by a wire (21), the said wire (21) being fixed to a plurality of insulating plug (22), wherein the shape of the mesh (2) is determined by the positioning of the insulating plugs (22) fixed in a building, the insulating plugs (22) are fixed in a plurality of places in order to provide a variety of mesh geometries (2), where an electromagnetic field is generated, and the electromagnetic field generated by the mesh (2) is intensified by winding the wire (21) around the body of the insulating plug (22) forming a coil (4) that induces the said electromagnetic field capable of repelling the birds in the vicinity of the mesh (2).