The invention belongs to the fields of hydraulic engineering, farm irrigation, urban and rural water supply and drainage and sewage discharge processing and relates to an intelligent hydraulic device integrating structures, water supply and drainage adjustment and measurement and an application method thereof. The intelligent hydraulic device is characterized in that a weir crest serves as a structure and a water supply and drainage passageway, a weir crest adjusting mechanism is used for adjustment, an intelligent sensor with a special water level integrated with a weir crest opening is used for measurement, during the water supply and drainage adjusting, with a control unit, the reliable intelligent water supply or adjustment is realized, the management device is visual and digital, and the hydraulic structure, the water supply and drainage adjustment and water yield measurement of the weir crest opening are integrally completed. The intelligent hydraulic device and the application method thereof are widely applicable to various application occasions with the hydraulic structure, the water supply and drainage adjustment and water yield measurement of the weir crest opening as main content of systems and industries including mines, the hydraulic engineering, the farm irrigation, the urban and rural sewage discharge and environment protection.