Tensioner is a device to tighten the strapping used for goods in the process of goods packing. The fixing of the tightener name strapping is respectively at the two ends of the strapping, which makes the strapping itself too complicated, and the strapping is only fixed by a simple snap, which is extremely easy to tun out and fall off, affecting the packing efficiency. Now research a side pull tensioner locking, fixing, cutting off are completed at one end of the tensioner, which makes the structure of the baler more concise, easy to carry, and the use of a unique strap slot design, effectively prevent the strapping in the tensioning process of disengagement.