Rotary supporting device for seat and sofa

The utility model discloses a rotary supporting device for a seat and a sofa. The rotary supporting device is characterized by comprising a supporting rod, a rotary connecting rod and a supporting panel, the supporting rod comprises a connecting part located at the bottom and a rotating matching part located at the upper end. The rotating connecting rod is of an L-shaped structure, and the bottom end of the rotating connecting rod is rotationally connected to the rotating fit so that the rotating connecting rod can rotate in the circumferential direction with the supporting rod as the axis. A rotating supporting seat is arranged at the free end of the rotating connecting rod, the bottom of the supporting panel is rotationally connected to the rotating supporting seat, and the supporting panel can rotate around the rotating supporting seat in the circumferential direction; the sofa comprises a seat component and the rotary supporting device, and the connecting part is fixedly connected with one side of the sea