The invention provides a wind driven generator with a transformer flexibly hung to the top of a tower drum and relates to a flexible transformer mounting structure of the wind driven generator. The wind driven generator comprises a generator cabin, a main rack, a converter/the transformer, a cooling system and the tower drum. The main rack, the converter and the cooling system are mounted in the generator cabin, and the transformer is not mounted in the generator cabin anymore. The generator cabin is mounted at the top of the tower drum. The wind driven generator is characterized in that the transformer is placed in the tower drum and flexibly hung to the lower portion of a base plate at the bottom of the main rack through slings; or the transformer is flexibly hung to the lower portions of cross beams located at the top of the tower drum through slings; a proper distance is reserved between the transformer and the main rack base plate or the cross beams so that personnel can reach the main rack from the transformer conveniently; a buffer layer is arranged on the inner wall of the top of the tower drum, and a small gap is reserved between the transformer and the buffer layer; and a space used for allowing the personnel to get on and off is reserved between the transformer and the main rack base plate or the cross beams. The wind driven generator has the characteristics of being novel in structure, easy and convenient to machine, convenient to assemble, high in stability, capable of reducing loss, investment cost and maintenance cost and the like.