The present invention relates to a device for automatically controlling the height of the rubber dam applied to the top beam for hydraulic power generation, agricultural and industrial intake, water intake, etc. according to the water level.;The present invention consists of a pressure gauge for detecting the overpressure of the rubber beam body, which consists of a plurality of pressure gauges with different setting values, and automatically adjusts the overpressure of the rubber beam body to automatically control the rubber dam, which can prevent a dangerous accident. to provide.;In addition, it is possible to automatically discharge the air in the rubber dam by a mechanical mechanism to provide a float type mechanical control device that can effectively prevent the flood accident of the rubber dam even when the operation of the valve means is stopped due to abnormal power failure.
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