The utility model discloses a pressure exhaust-type household fresh air system which comprises an external wall air port, a fresh air port, a partition wall ventilation slot, an air exhaust port and a pressure exhaust fan box; in household, each external wall of the room which can be directly communicated with the exterior is provided with an external wall air port, and the partition walls of the other rooms which cannot be directly communicate with the exterior are provided with partition wall ventilation slots; the pressure exhaust fan box and the air exhaust port can be mounted at the corners of the washing room; and the mud air entering the washing room from each room is connected with the pressure exhaust fan box through an air exhaust port pipeline so as to be finally pressed out of the door so as to form negative pressure. The fresh air system enables the fresh air to pass through each room in the house so as to ventilate each corner, so that the air cleanness in the house is high, and the health of the human body is facilitated; a negative pressure exhaust device used for an air supply system is small in size, and is not limited by the space and a small number of pipelines are arranged; therefore, the pressure exhaust-type household fresh air system is very suitable for the household.