The utility model relates to a chain structure of a printer bearing gripper bar, which comprises a paper out gripper bar with grippers and a paper collecting chain. Each gripper bar is connected with the paper collecting chain, which comprises an inner chain plate and an outer chain plate. A gripper bar seat is supported by two pins on the chain. Each pin is riveted with the outer chain plate, and the inner chain plate is riveted with a pin sleeve, in which the pin is fittingly connected with a clearance. The inner sleeve of a roller on the other pin is riveted with the outer chain plate. The inner chain plate is fittingly connected with the inner sleeve of the roller with a clearance, so that the other pin can be inserted in the sleeve through flexible rotation. The chain structure of the utility model is different from the chain structure of the common roller. Each pin of the bearing gripper bar seat is still riveted with the outer chain plate, and the inner chain plate is riveted with the sleeve, which is clearance fitted with the pin. The sleeve in the other pin roller is riveted with the outer chain plate, and the inner chain plate in clearance fit with the sleeve is rotatable. The utility model is provided with simple structure, easy manufacturing and installation, and low manufacturing cost.