Method for monitoring gas emission of return airway

The invention relates to a method for monitoring gas emission of a return airway. The method comprises the following steps that S1, two arched tracks which are crossed with each other are mounted in the return airway; S2, a pair of wind speed sensors are mounted on the two arched tracks, and a methane concentration sensor and a multi-parameter sensor are respectively mounted; S3, the wind speed is monitored in real time through two wind speed sensors, and the average wind speed is calculated; S4, the methane concentration, the carbon monoxide concentration and the carbon dioxide concentration in the return airway are monitored through the pair of methane concentration sensors and the pair of multi-parameter sensors on the two tracks; S5, receiving the average wind speed, the methane concentration, the carbon monoxide concentration and the carbon dioxide concentration through a return airway gas emission monitor; and S6, a return airway gas emission monitor calculates the real-time gas emission amount, the car