Gas control method for return airflow corner of coalmine coal working face

The invention discloses a gas control method for a return airflow corner of a coalmine coal working face; the gas control method comprises the steps of laying a main drawing-out pipe in a return air roadway in advance and laying a drawing-out branch pipe with a butterfly valve, which corresponds to a connection roadway; the control process comprises the following steps of: A. closing the connection roadway and the return air roadway when the working face is pushed forward to an entrance of the connection roadway; B. laying a wind tunnel from a closing part of the return air roadway to a closing part of the connection roadway in a penetrating manner; and drawing out gas of the return airflow corner by using the wind tunnel; and C. opening a butterfly valve on a drawing-out branch pipe of a connection roadway previous to the connection roadway in the step A for drawing out gas. According to the gas control method, the gas concentration of the return airflow corner of the working face can be effectively reduced,