The three-row cylindrical roller slewing bearing is equipped with three independent raceways, with upper axial, lower axial and radial raceways arranged separately. Each row of cylindrical rollers independently bears axial and radial loads respectively. Featuring ultra-high load-carrying capacity, this type is among the heavy-duty slewing bearings with the strongest bearing performance. It is ideally suited for large-scale heavy machinery operating under extreme heavy-load working conditions.