The utility model discloses a stringing pulley block device which comprises a cross arm, a paying-off pulley, a ground wire, a 180 kN rotator, a traction rope, a construction hole, a pulley block, a wire clamping device, a steel wire rope, an adjusting plate, a tension insulator string, a roller, a stringing rope and a tension clamp. The tension insulator string pulls the pulley block to swing onone side of the cross arm through the tension rope; the stress direction can be consistent with the stress direction of the ground wire; labor-saving principle of pulley block, the stress of the toolcan be greatly reduced; reducing construction load, the stringing construction operation can be completed through the existing tools and instruments; the pulley block is pulled by the wire tighteningrope to be in tightening or loosening connection between the wire clamping device and the adjusting plate; the number of the wire clamping devices is two, one wire clamping device is used for being connected with a steel wire rope, the other wire clamping device is used for being connected with a pulley block, protection measures are provided for the ground wire tightening process, falling of theground wire caused by out-of-control of the pulley block is avoided, and construction safety is guaranteed.