Heavy lifting door

The invention belongs to the technical field of lifting doors, and particularly relates to a heavy lifting door which comprises a lifting door body, first rails are vertically installed on the two sides of the lifting door body, the height of the first rails is not smaller than 1.8 m, the top ends of the first rails protrude in the direction away from the lifting door body, and the bottom ends of the first rails are designed to be closed. By arranging the traction assembly and the connecting assembly, in the process that the lifting door body is opened upwards, when a supporting block drives a balancing weight to move upwards through a supporting rod, a connecting column can pull the connecting column and a pull rod to move upwards through a buffer spring, and when the pull rod moves upwards, the lifting door body is opened upwards. The two roll shafts on the pull rod can pull the fixing plates and the first track to move by 10-15 cm in the direction away from the lifting door body through the limiting holes