The invention discloses a high-level water tank structure which comprises a water tank, and the water tank is of a single integral structure or is composed of at least two water tank units which workindependently. A cover plate is arranged at the top of the pool, a water inlet pipe is arranged on the side face of one side of the pool, and a water outlet pipe is arranged on the opposite side. A grit chamber and a guide wall are arranged inside the water tank, a support column is arranged on the guide wall, and the grit chamber is provided with an emptying pipe. By the adoption of the technicalscheme, cleanliness of water in the high-level pool can be effectively guaranteed, meanwhile, water flow in the pool is smooth, the flow state is good, construction is convenient, and the structure is safe. The structure is suitable for wide popularization and application in the hydraulic engineering field. Moreover, when the water pool is composed of a plurality of water pool units, each water pool unit can work independently and be emptied respectively, the structure in one water pool can be overhauled independently in time, water supply during overhauling is not affected, construction is convenient, and the structure is safe. The structure is suitable for wide popularization and application in the hydraulic engineering field.