The invention provides a convenient small tobacco leaf shear thread device. The tobacco leaf shear thread device comprises a desk, a support seat, a regulation rod, an impact regulation spring, a first active gear, a first lead chain wheel, a lower roll impact shaft, a first conduct chain, a first driven chain wheel, a roll groove, a second lead gear, a shear thread cutter, a second driven gear, a third lead gear, a third driven incomplete gear, a reciprocating cutter, a cutter restoration spring, a reciprocating rod, a cutter motor, cutter cams, an upper cam roll thread rolling shaft, a lower cam roll thread rolling shaft, a first driven gear, an upper roll impact shaft, down cutting blades, a second conduct chain, a second driven chain wheel, a second lead chain wheel, and a lead drive motor. The convenient small tobacco leaf shear thread device has the advantages that the pressing and formation process is conducted on tobacco threads, the structure is hay cutter in type, good toughness of tobacco is guaranteed, the tobacco threads are kept sweet-smelling by the cutting, thread rolling is conducted on the cut tobacco threads by the upper cam roll thread rolling shaft and the lower cam roll thread rolling shaft, the excellent fluffy sense of the tobacco threads is guaranteed, and excellent breathability is ensured at the roll making step.