The utility model relates to the technical field of air cylinders and discloses an air cylinder convenient to lubricate, which comprises a base, a cylinder
barrel is fixedly connected to the middle of the top end of the base, a
piston rod is mounted on the inner wall of the top end of the cylinder
barrel, a lubricating component is mounted at the top end of the cylinder
barrel close to the outer side of the
piston rod, and a bolt is fixedly connected to the middle of the top end of the
piston rod. A threaded sleeve is arranged on the outer side of the bolt, anti-loosening assemblies are installed on the left side and the right side of the top end of the
piston rod, connecting blocks are fixedly connected to the upper sides of the left end and the right end of the cylinder barrel, retention
lantern rings are fixedly connected to the opposite ends of the connecting blocks, and limiting assemblies are installed on the outer walls of the retention
lantern rings. Supporting rods are arranged on the inner walls of the retention
lantern rings, and inserting holes are formed in the ends, opposite to each other, of the supporting rods and correspond to the inner walls of the retention lantern rings. According to the utility model, the purpose of smearing lubricating oil on the
piston rod is ensured, and the whole cylinder is light and convenient to carry.