The inclined support tower power capacitor bank has such advantages as stable center of gravity and high seismic performance，and is widely used in HVDC application. In this paper，a kind of processing and installation method of inclined support tower power capacitor bank for HVDC application is introduced. The problems and difficulties in the processing and installation process of the inclined support tower power capacitor bank are solved in accordance with the structural characteristics of the inclined support tower power capacitor bank and by way of studying the processing method of the inclined supports，the processing and assembly method of the inclined support tower structures as well as on-site installation methods of the inclined support tower capacitor bank，and the efficiency and accuracy of processing and installation work are improved. It is proven by the engineering application that this method can make the production processing of the inclined support tower power capacitor bank and its installation on site more simple，convenient and efficient.