The invention primarily discloses a lubrication improved step chain. The technical scheme of the invention is as follows: the lubrication improved step chain comprises a plurality of hinges. Each hinge comprises a pair of inner chain plates, a pair of outer chain plates, a bushing, a pin roll and a roller. The inner chain plates are in interference fit connection to the bushing, the outer chain plates are in interference fit connection to the pin roll, the bushing is in clearance fit to the roller, oil holes are formed in two sides in the bushing, grooves are formed in two end surfaces of thebushing, first side gaps are formed between the inner chain plates and the outer chain plates, second side gaps are formed between the inner chain plates and the roller, a first side gap is formed between the pin roll and the bushing, a second gap is formed between the bushing and the roller, a first oil path is formed among the first side gaps, the grooves and the first gap successively, a secondoil path is formed among the second side gaps, the second gap, the oil holes and the first gap successively, oil storage tanks are arranged on two sides of the pin roll, and oil enters the oil storage tanks of the pin roll through the first oil path and the second oil path separately. The lubrication improved step chain provided by the invention has the effect of improving lubrication of kinematic pairs of the hinges, so that wear is reduced and the service life is prolonged.