A wire lifter comprises a column, a U-shaped fixing clamp, a wire tightening mechanism and a wire rope. The U-shaped fixing clamp is vertically welded on the bottom of the column. The lower side of the U-shaped fixing clamp is provided with a fastening screw. The wire tightening mechanism comprises a rotating shaft, a support, a ratchet and a pawl. The support is welded on one side of the column top. The two ends of the rotating shaft are arranged inside the U-shaped support in a rotatable way. The two ends of the rotating shaft are respectively provided with a cylinder and the ratchet. The pawl cooperating with the ratchet is pivoted on the support. A round hole for wrench operations is arranged on the cylinder. The central part of the rotating shaft is provided with a projection. One end of the wire rope is fixed on the projection while the other end fixes a hook. The lifter is fixed on a cross-arm angle iron. A wire is hooked through the hook in a lever block or the wire tightening mechanism and then reeled. The position of the wire can be conveniently adjusted. Manpower is saved. The working efficiency is further greatly improved.