A lifting and rotating device includes a lifting unit having a gas lift and a support member having a hinge; a rotating unit rotatable around the hinge; and a decompression unit having a handle movable between a release position and a control position, a pressure regulating member pivotally disposed on the hinge and normally located at a release position, and a cable having one end connected to the handle and the other end connected to the pressure regulating member at a position substantially located on the pivot axis of the hinge. The handle is normally at the release position and the relative position between the pressure regulating member and a control pin of the gas lift remains unchanged when the rotating unit rotates around the hinge. When the handle is moved to the control position by an external force, the pressure regulating member is moved to press the control pin.