Wire tightening device for power cable installation and use method

The invention discloses a wire tightening device for power cable installation, and belongs to the technical field of cable tensioning, the wire tightening device comprises a box body, the left end of the box body is connected with a first hook body used for hanging a telegraph pole cross arm, a tensioning assembly is arranged in the box body, and the tensioning assembly comprises a pull rope with the right end extending to the outside of the box body; the right end of the pull rope is connected with a second hook body, and the second hook body is detachably connected with a clamping assembly used for clamping a cable. The clamping assembly comprises an upper clamping head and a lower clamping head, the left end of the upper clamping head is fixedly connected with an upper inclined rod extending downwards in an inclined mode, the left end of the lower clamping head is fixedly connected with a lower inclined rod extending upwards in an inclined mode, and the middle position of the upper inclined rod is rotation