Cable tightener

The invention relates to the technical field of tighteners, in particular to a cable tightener which comprises a lifting device and a wire tightening device, wherein the wire tightening device comprises an installation support, a fixing piece, a moving assembly, a wire tightening lead screw and a wire tightening driving assembly, the wire tightening lead screw extends in the horizontal direction,the fixing piece and the moving assembly are distributed in the axial direction of the wire tightening lead screw, the fixing piece is fixedly connected to the installation support, and the moving assembly is in threaded connection with the wire tightening lead screw and is in sliding connection with the installation support, so as to clamp one end of a cable between the fixed part and the movingassembly; the lifting device comprises a mounting base, a lifting lead screw, a lifting frame and an adjusting knob, the lifting lead screw extends in the vertical direction, the lower end of the lifting lead screw is rotation