Sealing structure of thermal power station coal mill

The utility model belongs to the field of sealing mechanisms, particularly relates to a sealing structure of a thermal power station coal mill, and provides the following scheme aiming at the problems that the sealing effect of a device is poor and the use requirement cannot be well met due to the fact that only one-time sealing can be carried out in the prior art. An air inlet and an air outlet are formed in the two sides of the air duct door body respectively, a door frame is fixedly connected to the inner wall of the air outlet, a sealing plate is rotationally connected to the inner wall of the top of the air duct door body, and the sealing plate is located on one side of the door frame and used in cooperation with the door frame; the electric push rod is started, the rectangular block drives the annular sealing gasket and the rectangular plate to transversely move, the annular sealing gasket pushes the sealing plate to transversely move, at the moment, the sealing plate is extruded on one side of the door