The invention provides a cavity airflow control system. The cavity airflow control system comprises a plurality of cavities provided with draught fan filtering units, a central monitoring unit, air detection units and power sensors, wherein the power sensors are connected to the draught fan filtering units and is used for detecting the output power of the draught fan filtering units in the cavities and for sending output power data to the central monitoring unit; the air detection unit is used for sending the air status information of the cavities to the central monitoring unit; and the central monitoring unit is used for processing the information of the air detection units and the power sensors and for sending control commands to the draught fan filtering units for controlling the output power of the draught fan filtering units in the cavities so as to change the flow direction of air. The invention also provides a cavity airflow control method. The cavity airflow control method realizes the function of causing air to flow to the cavities with small ventilation volume from the cavities with large ventilation volume and achieves the technical effects of reducing the quality risk of products produced in the cavities and increasing the yield rate of the products.