The invention provides a tubular large-volume plasma polymerized coating device and belongs to the technical field of plasma. The tubular large-volume plasma polymerized coating device is used for preparing a polymer coating on the surface of a base material, and is characterized in that a vacuum chamber is tubular, an electrode and guide rails are mounted on the inner wall of the vacuum chamber, the electrode takes the shape of a cylindrical surface, is positioned on a cylindrical surface coaxial with the vacuum chamber and is divided into at least two parts, the guide rails are mounted in reserved gaps, the electrode is not in contact with the guide rails, jigs are mounted on the guide rails and are coaxial with the vacuum chamber, the base material to be treated is mounted in the jigs, carrier gas pipelines and single steam pipelines are arranged at the top of the vacuum chamber at intervals in the axial direction, vacuum exhaust pipelines are arranged at the bottom of the vacuum chamber at intervals in the axial direction, and vacuum chamber doors are mounted at two ends of the vacuum chamber to allow the jigs to be fed in and taken out. According to the tubular large-volume plasma polymerized coating device, the volume of the vacuum chamber is large, the plasma uniformity is favorable, the treatment batch is large, the efficiency is high, the cost is low, and the quality uniformity of products treated in batch is excellent.