According to the present invention, a smart system for supplying agricultural water comprises: a water storage tank receiving raw water from a water source such as a river, a lake, etc. and storing the raw water as agricultural water a pipeline diverging from the water storage tank and supplying the agricultural water to a place including a rice paddy and a field to use the agricultural water an agricultural water generator producing power by the agricultural water which flows in the pipeline a leakage sensor installed on the pipeline to sense a leakage a farm pond installed to control the feed rate of the agricultural water and the real use rate of the agricultural water on the upper side of the pipeline for the place to use the agricultural water a water level sensor sensing the level of the agricultural water in the farm pond a valve installed to control the agricultural water supplied to a branch part of the pipeline and a control center which checks the level of the agricultural water from the water level sensor of the farm pond, supplies the agricultural water by controlling the valve of the pipeline which supplies the agricultural water to the farm pond when the level of the agricultural water falls to a minimum reference value or smaller, and stops the supply of the agricultural water by controlling the valve of the pipeline which supplies the agricultural water to the farm pond when the level of the agricultural water becomes a maximum reference value or greater. Accordingly, a high-efficiency agricultural water supply chain can be established on a wide area by using the water storage tank and the farm pond. Furthermore, the agricultural water can be secured by using various water sources according to the surrounding environment of the place requiring the water. Accordingly, the agricultural water can be secured to the maximum even when the place is deficient in water. In addition, the agricultural water is allowed to be dispersed and carried even when a fl
