Special wire tightening device for linear cutting machine and linear cutting machine

The invention provides a special wire tightening device for a linear cutting machine tool and the linear cutting machine tool. The special wire tightening device comprises a supporting base, a slide supporting base and a guide wheel, wherein the supporting base is fixedly arranged on a wire rack of the linear cutting machine tool; the slide supporting base is positioned below the supporting base, and can be assembled on the supporting base in a sliding mode vertically relative to the supporting base; and the guide wheel is assembled on the slide supporting base, and can move vertically along with the slide supporting base relative to the supporting base. According to the special wire tightening device, the supporting base on the special wire tightening device is improved, so that the special wire tightening device is better matched with a machine tool, and constant tension of a molybdenum wire cutting line is ensured; the quality and efficiency problems that when the linear cutting machine works, the surface