Disclosed is a lifting mechanism comprising: a first connecting member (1) and a second connecting member (2); a part of the first connecting member (1) is inserted into the second connecting member (2) and forms a movable connection with the second connecting member (2) in the axial direction; and a force balancing member (3) disposed on the first connecting member (1) and the second connecting member (2); when the first connecting member (1) is moved by an external force F1 in a direction away from the second connecting member (2), the force balancing member (3) provides the first connecting member (1) with an assisting force in the same direction as the moving direction of the first connecting member (1); when the first connecting member (1) is moved by an external force F2 in a direction approaching the second connecting member (2), the force balancing member provides the first connecting member (1) with a resisting force in the opposite direction of movement of the first connecting member (1).