Abstract: Disclosed is a floodgate opening and closing system using a measurement of a motor revolution count, in that an opening and closing state of a floodgate formed at irrigation facilities for sewage, rainwater, agricultural water, freshwater and so on can be numerically transformed and the transformed data can be transmitted to a data collection apparatus such as a remote control system or transmission system and so forth through a communication network and so on, so that the opening and closing rate of the floodgate can be exactly perceived and controlled in a real-time on the remote place, whereby increasing the efficiency of water management.