Cable group synchronous tensioning device and construction method

The invention belongs to the technical field of building construction, and discloses a cable set synchronous tensioning device and a construction method.The cable set synchronous tensioning device comprises a tensioning tool, a first tensioning unit and a second tensioning unit, the tensioning tool is connected with a plurality of inhaul cables in a cable set, and a connecting lug plate on a main body structure is used for being connected with a cable head; the tensioning tool is located on the side, opposite to the connecting lug plate, of the cable head. The first tensioning unit comprises winding equipment, and the winding equipment is used for tensioning the cable group by winding and unwinding a steel wire rope; the second tensioning unit comprises bidirectional lifting equipment and telescopic adjusting equipment, the bidirectional lifting equipment is connected with the tensioning tool, the tensioning tool is provided with the adjusting equipment corresponding to each inhaul cable, and the telescopic e