Abstract: To promote the integrated development of nuclear power control equipment and new technologies, and improve the efficiency of nuclear power control equipment in its full life cycle management including design, production, manufacturing, operation and maintenance, this paper combines nuclear power control equipment with the theory of digital twin (DT) technology and proposes the concept of digital twin for nuclear power control equipment. Firstly, it elaborates and analyzes the current characteristics and development challenges of the full life cycle of nuclear power control equipment, covering five stages: overall equipment design, detailed design, production and manufacturing, performance testing, and operation and maintenance. Then, it expounds the composition of the digital twin body of nuclear power control equipment. On this basis, the key technologies for constructing the digital twin body of nuclear power control equipment are put forward, and the applications of the digital twin body in model establishment, state analysis, data processing and other stages are discussed. Finally, based on the concept of realizing virtual-real mapping of equipment through digital twin, this paper summarizes five key technologies and challenges under this system, aiming to provide a reference for the future integrated development of nuclear power control equipment and digital twin technology.