Pre-tensioning device for steel wire rope of elevator

The utility model discloses an elevator steel wire rope pre-tensioning device which comprises a fixed shell and a steel wire rope body penetrating through the middle of the fixed shell, the two sides of the inner wall of the fixed shell are fixedly connected with a plurality of fixed columns arranged in a staggered mode, and one end of each fixed column is movably connected with a telescopic column. A telescopic column is fixedly connected to one end of the fixed shell, a fixed circular ring is fixedly connected to the other end of the telescopic column, a steel wire rope body is connected to the middle of the fixed circular ring in a penetrating mode, annular grooves are formed in the two ends of the fixed shell, and sealing covers are connected to the interiors of the annular grooves in an embedded mode. The steel wire rope body is pushed away to be in a wavy line shape, stress is applied to the steel wire rope body in advance, part of vertical tension is counteracted in the rising process, the tensile capa