A docking mechanism, an elevator shaft module, and an elevator system. The elevator shaft module and elevator system includes the docking mechanism. The docking mechanism includes a first docking element having a first adjusting element; and a second docking element having a second adjusting element, the first docking element is adapted to dock the second docking element in an adjustable manner, and the first adjusting element is adapted to engage the second docking element, such that a docking position between the first docking element and the second docking element is changeable by adjusting one of the first adjusting element and the second adjusting element.