The invention discloses a configuration method for a parallel DC high-voltage transmission control system. Each electrode of each station of the parallel DC high-voltage transmission control system isprovided with two valve banks connected in parallel. Each valve bank is equipped with a control host. Each control host has a valve bank layer, an electrode layer and a double-electrode control function. Inter-station communication signals of two valve banks of each electrode are connected with an opposite station via a switch device. Inter-electrode communication signals of two valve banks of each electrode are connected with an opposite electrode via a switch device. According to the invention, no layering configuration is required. The method has distinctive advantages in parallel valve bank extension; change of prior valve banks is reduced and extension period can be shortened. When a control host of one valve bank in the parallel valve banks breaks down, operation influence on the corresponding electrode is comparatively small.