Mining air door locking system

The utility model relates to the technical field of coal mining, and discloses a mining air door locking system which comprises a compressed air pipeline for introducing underground compressed air, an air cylinder communicated with the compressed air pipeline and used for opening and closing an air door, and an air pressure adjusting structure arranged on the compressed air pipeline. The air pressure adjusting structure is arranged between the end, where underground compressed air is introduced, of the compressed air pipeline and the air cylinder. The air pressure adjusting structure comprises an air pressure adjuster, a pneumatic control valve and a pressure release valve which are sequentially arranged between the end, where underground compressed air is introduced, of the compressed air pipeline and the air cylinder. The number of the air doors is two, the compressed air pipeline is respectively communicated with the air cylinders on the two air doors by arranging an air pipe tee joint, and the number of t