Comfortable dental chair capable of synchronously adjusting back cushion and seat

The invention relates to the technical field of medical apparatus, and discloses a comfortable dental chair capable of synchronously adjusting a back cushion and a seat. The comfortable dental chair comprises a rotary base, wherein a driving gear is fixedly mounted in a support seat, a driven gear is in meshing transmission with the top of the driving gear, and a connecting rod is fixedly connected with the top of the driven gear; and a telescopic rod piece is fixedly connected to the right side of the connecting rod, a clamping block is fixedly mounted on the inner wall of the top of the cushion, a pull rope is fixedly connected to the left side of the clamping block, a back cushion is fixedly mounted on the right side of a rotating shaft, and supporting springs are fixedly mounted at thebottom of the back cushion. The back cushion is connected with the rotating shaft and the supporting springs, a patient leans against the back cushion and adjusts the back cushion according to the comfort degree of the patie