The invention discloses a loose flue-cured tobacco leaf packing device and a method for packing loose tobacco leaves by using the same. The loose flue-cured tobacco leaf packing device comprises a box body (1) without an upper surface and a lower surface, wherein a rough slice (2) is paved at the bottom of the box body (1). According to the invention, the box body without the upper surface and the lower surface is used as a shaping mould for packing the loose tobacco leaves, so that the loose tobacco leaves can be packed by artificial operation without large mechanical equipment and further the work which is originally finished at the fixed position in a tobacco leaf warehouse can be freely carried out at a tobacco stack. The device and the method for packing the loose tobacco leaves has the advantages that: firstly, the unbinding step in the leaf-unbinding and re-curing process of flue-cured tobacco is omitted so as to increase the work efficiency; secondly, the packing work can be finished by workwomen, and thus the problems that rural laborers are in serious shortage and the recruitment is difficult are solved; and thirdly, the oil press, breaking and hardening caused by packing the flue-cured tobacco are avoided, the consumption of high-quality raw materials is reduced, the utilization rate of the tobacco leaves is increased and the quality stability of sheet tobacco raw materials is facilitated.