Novel extensible type round table driven by mechanical mechanism

The invention relates to a novel extensible type round table driven by a mechanical mechanism and belongs to the field of machine design and manufacture. The novel extensible type round table driven by the mechanical mechanism is characterized in that a tabletop of the round table is skillfully divided into three layers, and a three-dimensional linkage mechanism is arranged below the tabletop of the round table in the design; by means of the three-dimensional linkage mechanism, the radial reciprocating motion and lifting space omni-directional linkage of a middle-top layer and a middle layer of the three layers of tabletop boards are achieved, and synchronous revolution motion of the three layers of the boards is achieved; and by means of a linked mechanical device, furniture like the round table can be changed from small to big or from big to small, and during using, the round table can be changed into a bigger or into a smaller by moving one of the tabletop boards. By means of the mechanical device, the problem that tabletops of the furniture like the round table are hard to extend in space is solved, and a solution is provided for effectively utilizing space in sites of households, restaurants, meeting rooms and the like.