The invention discloses a bird repellent device disassembling/assembling tool, comprising a telescopic tube assembly which comprises an external tube and an internal tube; a control cover which is equipped with a U-shaped slot for containing a U-shaped base of a bird repellent device; a first interior angle sleeve head which is coaxially arranged at the upper side of the internal tube and can rotate along with the internal tube; a second interior angle sleeve head which is arranged at the outer side of the external tube and can move vertically along with the internal tube, wherein the second interior angle sleeve head is opposite to a set screw connected with the lower part of the U-shaped base; and a protection assembly which comprises a bending plate, and a door plate arranged at a doorway formed by two ends of the bending plate. The protection assembly is arranged at the upper end of the control cover, there encircling the main shaft of the bird repellent device stretching out from the control cover. According to the tool, the bird repellent device can be assembled on a linear bear plate or can be disassembled from the linear bear plate through the control cover; the U-shaped base is fastened by the first interior angle sleeve head; and the bird repellent device is disassembled/assembled.