The invention discloses a turbo generator set device providing steam in different qualities. The turbo generator set device is characterized by comprising first and second steam turbines, first and second gear cases and a generator, the generator is a double-end driving type turbo generator, the first steam turbine is connected with the input end of the first gear case, the output end of the firstgear case is connected with one end of the generator, the second steam turbine is connected with the input end of the second gear case, and the output end of the second gear case is connected with the other end of the generator. Thus, a traditional turbo generator set device in which two sets of back pressure extraction turbine drive one generator to provide steam in four qualities is replaced, instead, two back pressure extraction turbines drive one generator to provide the steam in four qualities, the structure is simple and compact, a workshop occupies small space, and equipment and workshop building cost is reduced.