Flange or like-flange reinforcing ring, connecting structure and wind generating set

The utility model discloses a flange or like-flange reinforcing ring and a flange or like-flange connection structure employing the same. The flange is used for working together with a bolt to connect two fixed pipe fittings, a like-flange adopts a bearing structure and is used for working together with a bolt to connect a fixed part and a rotating part, a bolt hole to be matched with the bolt is formed in each of the flange and the like-flange, the reinforcing ring is used for being matched with the surface of the flange or the like-flange, and adopts a combined ring-shaped structure which is of an integral ring-shaped structure or consists of a plurality of laminates sequentially combined in the circumferential direction in a matched manner, and a through hole correspondingly consistent with the bolt hole in the flange or the like-flange is formed in the integral ring-shaped structure or the combined ring-shaped structure. The reinforcing ring can enhance the rigidity and the strength of the present flange or like-flange connection structure, reduce the bolt load and further prolong the service life of the connection structure. The utility model also discloses a wind generating set employing the connection structure, which can prevent accidents caused by fracture of the bolts and is good in running stability.