The invention relates to a hydraulic adjustable damping supporting roller. A bearing block matched with a connecting stationary shaft 1 and a supporting roller pipe body are welded into a whole; a pump fixed mount is fixed on a connecting stationary shaft I by welding; a liquid pipe fixed mount is fixed at one end of a connecting stationary shaft II; the other end of the supporting roller is welded with a snap ring and the bearing block, and the bearing block is fixed by an end face locking ring; and bearings are arranged in two side bearing blocks and the two side bearing blocks are fixed by a bearing end cover. An oil tank is fixed on the connecting stationary shaft II; the liquid pipe is spiral and is positioned on the outer side of the connecting stationary shaft II; an inlet and an outlet of a positive-displacement pump are connected with the oil tank by the oil pipe; and an air cleaner is arranged on the oil tank. The hydraulic adjustable damping supporting roller solves the problem that a rubber belt slides downward continuously after a conveyer drum is braked, achieves the aim of smooth brake control particularly the accurate brake control of the rubber belt of an inclined belt conveyer, prolongs the service life of the rubber belt, and improves the production efficiency. The hydraulic adjustable damping supporting roller is suitable for various mine inclined belt conveyers and meets the requirements of modern comprehensive mechanical mining.