The invention provides a timing sequence design method of dicycle information acquisition and processing execution in turns. The method include a first step of collecting sent block valve information of a bridge arm segmentation control unit in T1 period, and a second step of processing and comprehensively ranking the collected block valve information in T 2 period. A layering and segmenting type collecting and processing structure solves the problem of the limits to collecting ability and processing ability of large-scale submodule module information from valve base control equipment. The collection and processing can be carried out in a dicycle mode in turns. The formation of a microsecond level decision of enormous collecting and processing information is guaranteed. A dicycle achievement is adopted, the adopted method is that an acquisition cycle and a processing and counting period run in turns, and therefore whole voltage balance effect collected and controlled by a bridge arm is macroscopic and reasonable.