Positioning device and positioning method for cloth roller on tobacco shred storage cabinet

The invention provides a positioning device and positioning method for a cloth roller on a tobacco shred storage cabinet. By the adoption of the positioning device and the positioning method, the problem that the cloth roller is not well covered by cover cloth, and accordingly moisture and fragrance in tobacco shreds are dissipated can be solved, and the quality of the tobacco shreds is guaranteed. Meanwhile, the situation that the cover cloth gets out of an outlet of the tobacco shred storage cabinet along with finished tobacco shreds, and accordingly quality or equipment accidents are caused is avoided. The positioning device comprises a positioning support, a positioning rod and a fastening handle. When the finished tobacco shreds are covered, an operator just needs to make the cover cloth pass through the cloth roller and move to the position of the outlet of the tobacco shred storage cabinet, a square head of a rotary shaft of the cloth roller is inserted into a square hole in the positioning rod, then a