The invention relates to a method utilizing a bed rock bending band for constructing a coal mine interconnected underground water reservoir. The method includes steps of 1, geological condition exploration for bed rock bending band underground water reservoir construction; 2, determining of a selectable construction address for the bed rock bending band underground water reservoir; 3 interconnection construction of the bed rock bending band underground water reservoir; 4, construction of a mine water conveying, recharging and pumping system. Therefore, through analysis on the geological condition exploration for bed rock bending band underground water reservoir construction, on the basis of traditional address selection for the coal mine underground water reservoir, a total design utilizing the bed rock bending band for constructing the coal mine interconnected underground water reservoir is proposed, invalid external discharge of mine water resource is reduced and water resource wasteis avoided. Besides, by fully utilizing the banding bend formed through mine exploitation for constructing the underground water reservoir, the engineering construction cost is reduced. Finally, themine water source of coal mines in arid regions can be protected in the maximal level.