The invention relates to a seal side hung door. The seal side hung door comprises a door installation board, a sliding door assembly slidably installed on the door installation board and a driving mechanism driving the sliding door assembly to slide along the door opening and closing direction in order to open and close an opening of the door installation board. The sliding door assembly comprisesa pull board and a door board. The pull board can slide along the door opening and closing direction. Upper and lower ends of the door board are connected with the pull board through connection assemblies. Each connection assembly comprises an oblique sliding rail and a sliding block. The oblique sliding rail is obliquely arranged relative to the door board. The sliding block is in sliding fit with the oblique sliding rail. One of the oblique sliding rail and the sliding block is fixed on the pull board while the other is fixed on the door board. The above connection assembly further comprises an elastic part connected between the pull board and the door board such that each sliding block can be located at the initial position relative to the oblique sliding rail during door opening and closing process. The door installation board is provided with a limiting part which limits the door board to continue sliding after the opening in the door board is closed. The seal side hung door is simple in structure, small in motion friction and good in seal effect.