Tensioner is a device to tighten the strapping used for goods in the process of goods packing. The fixing of the strapping of the name of the tensioner is respectively in the two ends of the tensioner, which makes the tensioner itself too complicated and the strapping is only fixed by a simple snap, which is extremely easy to fall out and affect the packing efficiency. Now we have researched a kind of side pull tensioner whose locking, fixing and cutting are all done at one end, which makes the structure of the baler more concise and easy to carry, and adopts a unique design of baling belt slot to effectively prevent the disengagement of the baling belt in the process of tensioning.