A turbo-generator unit, wherein said turbo-generator unit comprises: a boiler, comprising a boiler body and at least one stage of superheater and at least one stage of reheater provided in said boiler body; said superheater and said reheater having their respective steam inlet and outlet and forming a header of said steam inlets and outlets; a header-connection area being formed on said boiler body at a position corresponding to said header of said steam inlets and outlets; a turbine unit, said turbine unit comprising at least one HP cylinder - and at least one IP cylinder; a generating unit, said generating unit comprising at least one generator connected with said turbine unit; a steam pipe system, said steam pipe system comprising at least HTHP steam pipes that connect said boiler with said HP cylinder, connect said boiler with said IP cylinder and are designed for transmitting HTHP steam; wherein in said boiler, said HTHP steam transmitted from said superheater firstly flows into said HP cylinder of a high-level shafting by way of said HTHP steam pipe; after said HTHP steam has done work, said steam exhausted from said HP cylinder flows into said reheater and generates a high temperature reheat steam after being heated; said high temperature reheat steam flows into said IP cylinder and then is discharged after doing work; characterized in that: said HP cylinder and said generator constitute the high-level shafting; said high-level shafting is horizontally shafted and positioned outside of said boiler body and close to said header-connection area. a boiler, comprising a boiler body and at least one stage of superheater and at least one stage of reheater provided in said boiler body; said superheater and said reheater having their respective steam inlet and outlet and forming a header of said steam inlets and outlets; a header-connection area being formed on said boiler body at a position corresponding to said header of said steam inlets and outlets; a turbine unit, said turbine unit comprising at least one HP cylinder - and at least one IP cylinder; a generating unit, said generating unit comprising at least one generator connected with said turbine unit; a steam pipe system, said steam pipe system comprising at least HTHP steam pipes that connect said boiler with said HP cylinder, connect said boiler with said IP cylinder and are designed for transmitting HTHP steam; wherein in said boiler, said HTHP steam transmitted from said superheater firstly flows into said HP cylinder of a high-level shafting by way of said HTHP steam pipe; after said HTHP steam has done work, said steam exhausted from said HP cylinder flows into said reheater and generates a high temperature reheat steam after being heated; said high temperature reheat steam flows into said IP cylinder and then is discharged after doing work; characterized in that: said HP cylinder and said generator constitute the high-level shafting; said high-level shafting is horizontally shafted and positioned outside of said boiler body and close to said header-connection area. said HP cylinder and said generator constitute the high-level shafting; said high-level shafting is horizontally shafted and positioned outside of said boiler body and close to said header-connection area.