The invention provides an entrance-and-exit single protection closed door. The entrance-and-exit single protection closed door comprises a door frame, a door leaf, a locking
assembly and a bottom sealing mechanism. A lower door doorsill of the door frame is flush with the ground; the locking
assembly comprises side locking heads and a first driving device, the side locking heads are connected to the door leaf, and the first driving device is connected to the centers of first transmission rods with the two ends connected to the side locking heads through first driving rods; the bottom sealing mechanism comprises lower locking heads, a sealing beam and pin shafts, the lower locking heads are connected to the door leaf in a drivable mode, penetrating locking-head sleeves are fixed in the sealing beam, and the pin shafts penetrate through the lower locking heads and the locking-head sleeves and extend out, so that the sealing beam is fixedly connected with the lower locking heads. According to the entrance-and-exit single protection closed door, the door doorsill of the single protection closed door is flush with the ground, an active doorsill does not need to be installed during wartime to conveniently pass on weekdays, and the quick-closing-in-place function and the protection sealing function during wartime can be achieved; the lower locking heads are matched with locking holes, the sealing reliability is enhanced, and the anti-
impact performance is improved; due to arrangement in the locking
assembly, operation is easy and convenient, and rapid opening and closing are achieved.