The utility model relates to a distribution overhead line stridees across line changing plumb -line device, including hoist and mount support and the drawing part of setting in hoist and mount support bottom, the hoist and mount support is including a top looks twin pulley block, two side twin pulley blocks and telescopic support rod, top looks twin pulley block and two side twin pulley blocks pass through telescopic support rod and connect for the triangle -shaped support. The utility model discloses the plumb -line device makes distribution lines run through wherein respectively through three twin pulley block, crosses over the line changing operation through the line changing mode of old tape ew line, and at whole line changing in -process, the wire all can only touch the pulley from top to bottom, the circumstances of lower frame wearing and tearing wire on the pulley can not appear, has improved the security, and this plumb -line device can adapt to the line changing operation of different conductor spaces simultaneously, and the commonality is strong, and this plumb -line device operation convenient to use, and factor of safety is high.