Supercritical carbon dioxide split-flow recompression cycle power generation system and adjusting method

The invention discloses a supercritical carbon dioxide split-flow recompression cycle power generation system and an adjusting method. In the system starting stage, a starting motor provides power for a main compressor, a dragging turbine is in a static or low-rotating-speed state, the rotating speed of the dragging turbine is lower than that of the starting motor, a second overrun clutch is engaged, and a first overrun clutch is disengaged; and in the stable operation stage of the system, the turbine is dragged to drive the recompressor and the main compressor, the first overrun clutch is engaged, the second overrun clutch is disengaged, the starting motor quits operation, and the recompressor and the main compressor have the same rotating speed. In the starting stage, the starting motor only drives the main compressor to rotate, so that the starting work of the system can be smoothly completed by adopting relatively low motor type selection power and operation power consumption; meanwhile, after the startin