The invention discloses a pre-twisted wire suspension device for replacing a ground wire. The device comprises a support, wherein a bottom portion of the support is equipped with a lower locking device which can be locked with a cross arm pair, the middle portion of the support is fixedly provided with a main hinge shaft, the main hinge shaft is hinged with a left arm and a right arm which swing up and down at left and right sides, end portions of the left arm and the right arm are equipped with pulley sets, the pulley sets are wound by a pull wire, an upper end of the pull wire is fixedly connected with a wire roller, a lower end of the pull wire is connected with a wire sleeving device in sleeving matching with the ground wire, and an upper portion of the support is provided with a control mechanism used for controlling coiling and uncoiling of the pull wire. The device is advantaged in that rapid mounting and fastening on the high-altitude cross arms can be carried out, assembling is rapid, force-saving suspension is realized, the relatively large operation space is provided for replacing the ground wire metal tool, the ground wire is excellently protected, damage to the groundwire is avoided, operation is simple, and high safety is realized.