The invention relates to a sealing door of a refrigerated container. The technical scheme includes that a longitudinal mounting lead screw is arranged in the middle of a sealing door body, a lead screw seat is mounted on the lead screw in a meshed manner, a worm gear head is mounted at an end of the lead screw in a meshed manner and is positioned on the outer side of one bearing block, and a hand wheel is coaxially and fixedly arranged on the worm gear head; two follower wheels are respectively hinged on the sealing door body in a mirror symmetry manner and are positioned on two sides of the lead screw, one ends of two swing arms are eccentrically hinged on disc surfaces of the two follower wheels, and the other ends of the swing arms are respectively hinged on the lead screw seat in a mirror symmetry manner; and two vertical connecting rods are respectively hinged on hinged points of the swing arms on the disc surfaces of the two follower wheels and are radially symmetrical to the hinged points, and two plug pins are coaxially hinged at two ends of each swing arm. A mechanical transmission structural mode is adopted for the sealing door and particularly includes that a driving rotating wheel rotates clockwise or anticlockwise to drive transmission of a connecting rod mechanism, power is distributed to the follower wheels, the follower wheels control the stroke of a strut, and the door of the container is opened or closed by the aid of stop pins. The sealing door is scientific and reasonable in integral structural design and good in sealing effect.