Nuclear power station steam -operating is 3 grades of steam solenoid valves of nuclear safety for auxiliary feed water pump includes valve body, sleeve, lower flange, guide way, case subassembly, valve barrel subassembly, electromagnetic drive mechanism, establishes armature assembly, plug wire subassembly, shroud between electromagnetic drive mechanism. The cover wound packages is in the valve body, and the sleeve installs inside and is equipped with case subassembly, its valve rod overcoat guide way to with the muffjoint. Lower flange and valve body are fixed with screw thread connection, the corresponding flange that is fixed with of valve barrel subassembly, the valve barrel subassembly through last flange with stud and lower flange fastening, messenger's valve barrel subassembly end tightly is connected with the valve body end. The valve rod of case subassembly is connected with the nested armature assembly's of electromagnetic drive mechanism the iron core that moves. Electromagnetic drive mechanism threaded connection valve barrel subassembly is equipped with the sealed pad of line shell among them. The plug wire subassembly is equipped with the cable to be fixed on the shroud. The utility model discloses can satisfy ambient condition such as the height is wet, high fever, high radiation, work vibration, heat ageing to small, light in weight has, the reaction is nimble.