The utility model discloses an easy-tearing cutting roller device for a package. The device comprises a pair of side vertical plates used for supporting and arranged at an interval symmetrically and a top plate which is arranged at the tops of the pair of the side plates to connect the two side vertical plates. A first roller and a second roller which are parallel and arranged at an interval are arranged between the pair of the side vertical plates, a pair of first shaft seat mounting plates supported onto the side vertical plates is connected symmetrically with two ends of the first roller, and a flexible blade is attached to the surface of the outer circumference of the first roller. The first roller is arranged between the second roller and the top plate, a pair of air cylinders is arranged symmetrically at the two ends of the top surface of the top plate, and a pair of air cylinder pulling blocks which penetrates the top plate and is connected with the corresponding air cylinders is arranged symmetrically on the lower surface of the top plate. A connection block connecting the first shaft seat mounting plate with the corresponding air cylinder pulling block is arranged between the first shaft seat mounting plate and the corresponding air cylinder pulling block respectively. The air cylinders, the air cylinder pulling blocks, the connection blocks and the first shaft seat mounting plates on the same sides are connected successively and sequentially, and the first roller is driven by the air cylinder to reciprocate relative to the second roller.