Abstract: The utilization of mine return airflow waste heat system has been widely used as a clean heat source to replace traditional coal-fired boilers in coal mine heating in cold and frigid regions. In the actual operation of the surface heat extraction heat pump system, the efficiency of the heat exchanger is crucial for the heating effect. In engineering applications, there are visible disturbances in the heat extraction chamber and blockages in the fins of the heat exchanger. This article takes practical engineering as an example, based on key data such as velocity and pressure in the heat extraction chamber, and uses Fluent software to simulate the technical characteristics of air distributions in the partition wall heat extraction of mine return airflow under different positions of the reverse air door. The author analyzes the airflow velocity and pressure distribution, proposes the impact of opening different positions of the reverse air door on the airflow passing through the heat exchanger, determines the optimal position of the reverse air door, and ultimately achieves the research goal of reducing the cleaning frequency of the heat exchanger, delaying the blockage cycle, and improving the overall performance and economic benefits of the system.