The utility model relates to the field of power generating boiler coal filtering devices, in particular to a power generating boiler double-layer coal filtering device based on flow control. The power generating boiler double-layer coal filtering device comprises a primary air pipe and further comprises a rotary flow control gear, an outer shell, an upper hopper body and a lower hopper body, wherein the outer shell is matched with the tooth surface of the rotary flow control gear. A feed pipe is arranged above the outer shell, a hopper nozzle of the upper hopper body is installed downwards below the outer shell, an opening of the hopper nozzle of the upper hopper body is provided with a coarse powder separating disc with large holes, coarse powder caterpillar conveyors are installed around the coarse powder separating disc, a hopper nozzle of the lower hopper body is installed downwards in the positions of the large holes of the coarse powder separating disc, an opening of the hopper nozzle of the lower hopper body is provided with a fine powder separating disc with small holes, fine powder caterpillar conveyors are installed around the fine powder separating disc, and the positions of the small holes of the fine powder separating disc are connected with the primary air pipe. The coal filtering device is novel in structure and convenient to operate, safety is well guaranteed, coal resources can be effectively saved, and operating cost of a power plant is controlled.