The invention provides an airtight shielding door, which comprises a doorframe and a door leaf. The door is characterized in that the door leaf is connected with a track through a translation component and can be driven to move along the track to and fro by a motor and a driving device arranged on the door leaf; a gasbag and a reed are arranged on the door leaf; the gasbag is positioned between the door leaf and the doorframe and/or between the door leaf and the ground; the gasbag is tubular; and the reed under the extrusion of the gasbag can be deformed and electrically connected with a shielding component on the doorframe and/or a conductive plate on the ground. The door adopts an inflatable reed structure, namely the special reed is lined with the gasbag. After the door is closed, the gasbag is inflated to allow the finger-shaped reed to be electrically connected with the shielding component on the door leaf (or the doorframe) so as to achieve the aim of shielding.