Abstract: In order to solve the problems of repeated signal acquisition and signal electromagnetic interference in traditional large and medium hydropower station, the digitization renovation should be realized. We discussed 3 basic characteristics of the digitization hydropower station: primary device intelligence, secondary equipment cyberization and communication standardization. On the basis of the study on key technologies such as integration platform and digitization of automation component, we designed the digitization solution of Manwan Hydropower Station. The research shows that the digital hydropower station is completely feasible in technology, and the digital reformation will improve the reliability of equipment, significantly enhance the economic operation level and benefits of the power plant.