The present invention is a pallet strapping device having a platform, a lower guiding strap portion, an upper guiding strap portion, a first frame portion, a second frame portion and a central guiding strap portion. By controlling a first guiding strap portion, a second guiding strap portion, and the central guiding strap portion that is moved to a retracted position, a first guiding strap circulation path can be formed. In addition, by controlling the first frame portion, the second frame portion and the central guiding strap portion that is moved to an extended position, a second guiding strap circulation path is formed. The present invention is capable of switching to different strapping paths corresponding to different pallets for strapping. Besides, it is quite convenient to conduct strapping tasks under the condition that the corresponding pallets is not needed to depart from the platform of the pallet strapping device.