The embodiment of the invention provides a gear lubrication method and system for a wind generating set and the wind generating set. The gear of the wind generating set is equipped with a lubrication component. The method comprises the steps that a current rotation angle of the gear is measured; and if a current control angle range to which the rotation angle belongs is different from a control angle range to which a previously-detected rotation angle belongs, lubrication control operation is executed according to the number of executed times of lubrication in the current control angle range to which the rotation angle belongs, wherein if the number of executed times of lubrication does not exceeds a preset threshold value of times of lubrication, the lubrication component is controlled to execute lubrication operation. By adopting the technical scheme disclosed by the invention, whether the gear is lubricated or not can be automatically determined according to the number of executed times of lubrication in the control angle range to which the rotation angle of the gear belongs, so that labor cost is reduced, and effective lubrication for the gear is ensured; and meanwhile, overlubrication of the gear is avoided.