Adjustable hydraulic supporting device

The utility model relates to the technical field of building construction, and provides an adjustable hydraulic supporting device which comprises a hydraulic cylinder body, the hydraulic cylinder body comprises a cylinder body, a piston rod and a rotating seat, the piston rod is slidably connected in the cylinder body, the bottom of the cylinder body is used for fixing the rotating seat, a bottom plate is arranged at the bottom of the hydraulic cylinder body, and an adjusting mechanism is arranged between the bottom plate and the hydraulic cylinder body. A cleaning mechanism is arranged at the top of the cylinder; the cleaning mechanism comprises a fixing ring fixed to the top of the cylinder body, a cleaning plate used for making sliding contact with the peripheral wall of the piston rod is arranged in the fixing ring, a rotatable screw is installed on the side wall, away from the piston rod, of the cleaning plate through a bearing, and the cleaning plate can reciprocate along the axis of the screw. The pist