The utility model discloses a prevent rotatory pneumatic cylinder that hangs belongs to pneumatic cylinder technical field. Include cylinder and the piston rod that stretches out the cylinder, the cylinder overcoat has sleeve, sleeve one end and piston rod fixed, it has axial spout to open on the sleeve wall, the outer fixed surface of cylinder has the location axle that is located the sleeve spout. The utility model discloses dustproof making good use of can guarantee that the piston rod is not collided with by foreign matters such as stones, good antiwear characteristic and impact resistance have to the cost is lower, the guidance quality can be good, long service life.