By using the airflow of the fan to form positive pressure in the air duct, forced ventilation can be achieved to regulate the internal environment of the greenhouse, achieving ventilation, cooling, and airflow uniformity, making the greenhouse environment more conducive to plant growth. This increases the uniformity of airflow, temperature, and humidity in the crop root environment. Compared with greenhouses without air duct ventilation systems, it can reduce the number of top windows, lower the frequency of opening top windows, and reduce the number of mechanical ventilation systems, which in turn reduces energy consumption, improves resource utilization, and lowers costs.