Display-based rotatable support capable of being automatically tightened

The invention discloses a displayed rotatable support capable of being automatically tightened. The displayed rotatable support comprises a supporting shaft, wherein a hollow block penetrates throughthe side face of the supporting shaft, a sleeve is slidably connected to the surface of the hollow block, a swinging rod is fixedly connected to the top of the sleeve, rollers are rollably connected to the inner wall of the sleeve, and a bearing block is rollably connected to the side, close to the axis, of the rollers. A bearing toothed rod is rotatably connected to the side, away from the axis,of a deflection rod, squeezing rods are rotatably connected to the surface of a bearing gear, an adjusting box is slidably connected to the side faces of the squeezing rods, a lubricating box is arranged inside the bearing block, a T-shaped rod penetrates through the side face of the lubricating box, and the side face of the T-shaped rod is in threaded connection with a threaded rod. According tothe displayed rotatable sup