Three row roller slewing bearing and the bearing structure of left and right sides of the distribution is symmetrical, including outer ring, gland, inner ring, inner ring, sealing ring, roller, roller and cage, second bracket will be the second and third cage, outer ring for shape, located in the lateral, outer ring by screws, the upper part of lower part through the gland sealing cover, inside the circle with screw inside the ring connection, through the top and bottom sealing ring and outer ring connection, pass through the middle of the roller and outer ring, roller equipped with cage and second cage, among the second roller set, circle and inner circle between, on the third set up in the middle of the second roller.Compared with the existing technology, the invention ADAPTS to the wind power generation, the high air powerful wind and the rotating load, improves the processing property, and ADAPTS to the field air work characteristics of the wind power generation.