Abstract: As belt conveyor passing through the air door in high gas outburst heading face, because of large sectional area, serious air leakage, it is easy to cause disaster expand when the accident occurred in heading face. In order to solve the problem such as high air leakage rate at air door and insufficient strength of air door anti-gas outburst as conveyor belt passing through the door, the article designs the device for belt passing through air door. Field use shows that the device is simple in structure, the belt linkage realizes the automation, which greatly reduces the air leakage rate and improves the anti-disaster ability of air door, and it obtains the good economic benefit and social benefit.