Air barrier for controlling underground air flow in coal mines

The utility model relates to underground gas control in coal mines, particularly relates to an air barrier for controlling underground air flow in coal mines, and solves the problems that a present air barrier used in underground coal mines has no unified structural standard, has varied quality and can not guarantee the operational stability. The air barrier comprises a bearing support, a fixed frame and a PVC board, wherein the bearing support consists of a plurality of steel vertical rods and cross rods, which are perpendicular to and crossed with one another; the fixed frame is fixed on the bearing support and made of channel steel; the PVC board is embedded into the fixed frame; the vertical rods and the cross rods which together form the bearing support adopt the same structure and all consists of compressed pipe sets, extension pipe sets and regulating pipe sets; and the rim of the bearing frame consists of at least two sections of sleeved channel steel, and the adjacent channel steel can move relative