The utility model relates to a generator bearing structure. The front bearing is sleeved with a front bearing sleeve, a front bearing inner cover and a front bearing outer cover are arranged on the two sides of the front bearing respectively, a front bearing oil flinger is arranged in the front bearing outer cover, a front oil injection channel is formed in the front bearing sleeve, a front connecting channel is formed in the front bearing inner cover, and a front oil collecting disc is arranged at the bottom of the front bearing outer cover. The rear bearing is sleeved with a rear bearing sleeve, a rear bearing inner cover and a rear bearing outer cover are arranged on the two sides of the rear bearing respectively, a rear bearing oil flinger is arranged in the rear bearing outer cover, arear oil injection channel is formed in the rear bearing sleeve, a rear connecting channel is formed in the rear bearing inner cover, and a rear oil collecting disc is arranged at the bottom of the rear bearing outer cover. Friction between the balls and the inner ring and between the balls and the outer ring is reduced, and power generation efficiency is improved. And the lubricating oil is prevented from accumulating in the front bearing outer cover and the rear bearing outer cover to influence the cooling effect.