The invention discloses an overhead transmission line trip-out sound positioning device. The overhead transmission line trip-out sound positioning device includes a left block and a right block whichare hinged together through a horizontal hinge axle, wherein a left circular groove which encircles the left half part of the transmission line is arranged on the upper part of the buckling surface ofthe left block; a right circular groove which encircles the right half part of the transmission line is arranged on the upper part of the buckling surface of the right block; a locking device which is used for enabling the left block and the right block to be correspondingly clamped with the transmission line is arranged between the left block and the right block. The overhead transmission line trip-out sound positioning device has the advantages of being able to determine a fault circuit by monitoring the trip-out sound, being able to determine the fault circuit through electric signal change of the line, being able to quickly feed back the fault signal to a ground maintainer, being able to transmit the fault information to a monitoring server in a wireless communication mode in real time, and operating around the clock.