Heat preservation airtight door for grain depot

The utility model relates to the technical field of grain depot doors, and provides a heat preservation airtight door for a grain depot, which is labor-saving to open and close and comprises two door frames and two door plates, door grooves matched with the door plates are arranged on the door frames, a top frame and a bottom frame are connected between the two door frames, moving grooves are arranged on the top frame and the bottom frame, a first motor is arranged in each door frame, and a second motor is arranged in each door frame. The interiors of the two door grooves are rotationally connected with adjusting rods, the output ends of the first motors are fixedly connected with the adjusting rods, the peripheries of the adjusting rods are provided with two external threads with opposite rotating directions, the door plates are in threaded connection with the adjusting rods, the two door plates are connected with locks, the two door plates are both connected with sealing gaskets, the door plates are connect