The utility model discloses a knapsack-type pneumatic shoot cutter, which is provided with a small-scale air compressor (2), is equipped with a reel (5), is supplied with power by a small-scale gasoline engine (3) connected with the compressor and is assembled on a rack (1). The rack is in a double-L-shaped bent pipe structure. The upright part of the double-L-shaped bent pipe structure is bent to form a portal frame (7), on which knapsack shoulder straps (9) are installed. A bottom plate (10) used for installing a mechanical device is fixed at the bottom of the double-L-shaped bent pipe structure. The knapsack-type pneumatic shoot cutter disclosed by the utility model is convenient to move because the load is born by shoulders, can be conveniently carried up and down a slope and is the most portable device of like products.