Swivel chair chassis with free lifting function

The utility model relates to the technical field of swivel chairs, in particular to a swivel chair chassis with a free lifting function, a telescopic component is sleeved on a second rotating rod and comprises a rotating plate, first rotating pins are mounted at two ends of the rotating plate, a chair seat is fixedly connected to the tops of the first rotating pins, and a second rotating rod is sleeved on the chair seat. The first rotating pin is sleeved with a telescopic rod, the other end of the first rotating pin is sleeved with a telescopic plate, the telescopic plate is installed in an insertion hole of the chair seat, the large belt wheel rotates to enable the rotating plate on the second rotating rod to rotate, and then the rotating plate on the rotating plate moves; the telescopic plate can slide out of the telescopic hole of the chair seat, so that the bottom space of the chair is enlarged, and a tall person can sit on the swivel chair or sit comfortably. 本实用新型涉及转椅技术领域，具体是一种具有自由升降功能的转椅底盘，所述二号转动杆上套设有伸