Automatic hydraulic drum dumper is introduced in German technology, self-created newly drum dumper style which is characterized by safety, save labor and low dust density and so on. Its operational principle is: clipping hydraulic cylinder and rotating hydraulic cylinder driven by electromagnetic valve with hydraulic power controller. This clipping cylinder makes its frame and container up to the rubber seal rings of stainless discharging drum, then rotating the hydraulic cylinder driving and rotating the crank, bring the roll-over stand to roll to its target, open the discharging valve to discharging these materials, in order to discharge them completely, it can start up the pneumatic vibrator to achieve ideal result.