The sub-chamber reverse blowing dust bag dust collector is usually divided into several chambers, each of which has a separate ash hopper, dust-containing gas inlet pipe, clean gas outlet pipe, and reverse suction pipe, which are connected to the main intake pipe and the reverse suction pipe respectively. The suction manifold is connected. When one room is blown back to clean the ash, the other rooms are in normal filtration operation. The reverse blower enters the cleaning chamber through the reverse blower switching valve 6, and the reverse blower blows to the filter bag to blow the filter bag in the opposite direction to the normal filtering direction, and the dust on the inner surface of the filter bag is blown into the ash hopper.