The invention discloses a flange and a power transformation framework. The flange comprises a first flange cylinder and a first flange plate; the first flange cylinder is axially arranged into a hollow structure; the first flange plate comprises a first plate surface and a second plate surface which are opposite to each other; and the first plate surface is fixedly connected with the outer peripheral surface of the first flange cylinder. When the flange provided by the invention is used for connecting a cross beam and a supporting piece in the power transformation framework, on one hand, the number of elements of the power transformation framework can be reduced, raw materials are saved, the overall weight of the power transformation framework is reduced, transportation is convenient, andon the other hand, the connection strength between the cross beam and the supporting piece can be enhanced.