Vacuum chamber automatic door capable of realizing translation and pre-tightening in one step

The invention discloses a vacuum chamber automatic door capable of realizing translation and pre-tightening in one step. The vacuum chamber automatic door comprises a door body, a door frame, a supporting frame, a power mechanism and a movable connecting mechanism. The door frame is connected with the door body through the movable connecting mechanism. The movable connecting mechanism comprises aforce application block arranged on the door frame. The force application block is connected with a stop block through a force application shaft and a spring. A third sliding block is arranged on thestop block. The third sliding block slides on a third guide rail. The third guide rail is mounted on the door frame. The stop block is further connected with connecting rods. The two ends of each connecting rod are connected with the door body through swing arms correspondingly. The connecting rods, the swing arms and the door body are connected in a hinge mode to form a four-connecting-rod structure. A supporting rolling