An unburied hydraulic door hinge system f or automatically closing a door is directly mounted on a bottom corner of a door. Since the unburied hydraulic hinge system can be installed on the bottom comer of the door, it does not damage the aesthetic appearance of a transparent glass door such as a reinf orced glass door, and is very easy to install and repair because it is not buried. From, the maintenance point of view, the worker can easily gain access thereto because the split-type mounting plates can be quickly and easily separated. A hydraulic cylinder and a rotating drive mechanism., having a simplif ied structure and operation, not only improve the durability and lif espan of the hydraulic hinge system but also provide the possibility of mass production as well as production cost saving. Consequently, the hydraulic door hinge system has high economical eff iciency.
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