The invention relates to a wire-drawing device which is used for applying tension force on an elastic thread wound on an object. The wire-drawing device comprises a main carrying table, a first sub-carrying table, a second sub-carrying table and a driving device, wherein the main carrying table comprises a flat plate, a fixed rod and a track, wherein the fixed rod and the track are arranged at one side of the flat plate, and the fixed rod is provided with a first fixing device used for fixing the first end of the elastic thread; the object is fixed on a first carrying seat of the first sub-carrying table; a second carrying seat of the second sub-carrying table is provided with a second fixing device used for fixing the second end of the elastic thread; the second sub-carrying table is driven to move on the track by the driving device so as to adjust the tension force of the elastic thread; and the first sub-carrying table is driven to slide on the track by the tension force of corresponding elastic thread.