Nested elevator door structure and elevator thereof

The nested elevator door structure comprises a door plate and a movable reinforcing rib, the door plate comprises an embedded door plate and an outer sleeve door plate, the embedded door plate can be folded and unfolded along the inner side face of the outer sleeve door plate, the embedded door plate moves in the width direction of the outer sleeve door plate to adjust the width of the door plate, one end of the movable reinforcing rib is connected with the embedded door plate, and the other end of the movable reinforcing rib is connected with the outer sleeve door plate. When the movable reinforcing rib moves to the lower limit position, the door plate shrinks, when the movable reinforcing rib moves to the upper limit position, the door plate is opened, and when the movable reinforcing rib is located at the lower limit position, the embedded door plate partially or completely shrinks to coincide with the outer cover door plate. And when the movable reinforcing rib is located at the upper limit position, at l