The invention discloses a structure of a large-scale nuclear power half-speed steam turbine power generator. Heat energy released through nuclear fission is used for generating electricity, and the power generating mode is an important low-carbon power generating mode. The power generator adopting the structure is characterized in that concentric rotor windings are embedded into 40 rotor groove wedges, damp strips are arranged under each groove wedge, the rotor windings, the end parts of the damp strips and damp tiles are fixedly arranged on a rotor body through protection rings of heat sleeves, and four-electrode rotor being 1500r/min is formed. 96 wire rods in a hollow and solid four-row plied wire replacement state are embedded into 48 grooves of a stator iron core, the stator iron core with stator windings is placed into a machine seat, and a stator is formed. The stator, the rotor, a bearing, a hydrogen cooler and the like simultaneously form the large-scale nuclear power half-speed steam turbine power generator. The large-scale nuclear power half-speed steam turbine power generator can adapt to the nuclear power generation, has great capacity and can realize the long-period safe and reliable operation through bearing the basic load of an electricity network.