Fiber belt tensioner, firstly, the pressure belt chute is moved by the handle of the pressure belt chute, the strapping is placed on the belt holder, and the control pressure belt chute handle closes the pressure belt chute. This design can effectively prevent the strapping from overflowing and the packing tape is neatly arranged. Packed goods, packed packing straps are wrapped around the fixed slot of the strapping, and the tensioner handle is controlled. Tensioner device handle and tensioning gear engage, drive the fixing belt of strapping to rotate synchronously, strapping tighten synchronously, wait for the tensioning request, excess strapping on the cutting device, remove the handle of cutting device, cut off the excess strapping, and lock the whole packing process with packing knife.