The high-voltage large-capacity flexible DC converter valve is the core equipment of the DC power grid, which has solved such power grid problems as DC networking and new energy access in China. The valve tower in its entirety adopts an encircling double-row multi-section supporting design, and combinations can be made freely to meet the requirements of different capacities. Power components and control components are arranged separately to solve the problem of strong electromagnetic interference. The brushed metal rounded rectangle wrap design is adopted around the product to reduce the sense of distance between the valve tower and people and enhance the sense of order of the valve tower. With a modular design, the power components are versatile and easy to maintain. Considering the influence of parasitic parameters, the electrical circuits adopt a symmetric design to highlight the balance and stability of the product.