A wind power generator unit, comprising a bearing system, a rotor (2), a hub (3) and a flow guiding cover (4). The flow guiding cover (4) is located outside the hub (3), the bearing system comprises a bearing outer ring (11) and a bearing inner ring (12), and the rotor (2) and the hub (3) are connected to a rotating portion of the bearing system. The wind power generator unit further comprises a bearing cooling device, the bearing cooling device comprises several openings located on or near the flow guiding cover (4), and the space between the flow guiding cover (4) and the hub (3) is in communication with the outside by means of the openings. At least a portion of the bearing system is exposed to the space, and cooling air can flow into the space from the openings to cool the bearing system.
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