Table and chair lifting mechanism

The utility model relates to the technical field of household product installation, in particular to a table and chair lifting mechanism which not only can be manually finely adjusted, but also can adjust the height of a table and a chair to the greatest extent without influencing the attractiveness. The table and chair supporting leg is composed of a table and chair supporting leg round tube (1), a decorative tube (2), a nut (3), a screw rod (4) and a leg sleeve (5), the leg sleeve (5) is sleeved at the bottom end of the decorative tube (2), the screw rod (4) is upwards welded on the inner wall of the bottom end of the decorative tube (2), the nut (3) is welded on the inner wall of the bottom end of the table and chair supporting leg round tube (1), an external thread of the screw rod (4) is matched with an internal thread of the nut (3), and the table and chair supporting leg round tube (1) is downwards sleeved in the decorative tube (2). The outer diameter of the table and chair supporting leg round pipe (