The utility model discloses a dredging sediment diversion dam which is a river dam and has the functions of depositing the sediment of the river in a water storage sediment diversion area, supplying the river water to the artificial sightseeing lake as the landscape belt through a water inlet and ensuring the water flowing in the artificial sightseeing lake to be clear. A dam body of the dredging sediment diversion dam is connected with a segregation dam, the dam body extends and closes to one side of an upstream retaining dam firstly in a linear shape and then in an S-shape against the water flow direction till the dam body is connected with a river embankment; the dam body is provided with a water inlet close to the retaining dam; and the upper edge of the water inlet is parallel and level to that of a waster storage dam. The dredging sediment diversion dam is built at the upstream of the water storage dam and the first-class retaining dam and is connected with the segregation dam. The dam has the functions of accumulating the river water with the sediment in the water storage sediment diversion area, depositing the sediment in the water storage sediment diversion area, supplying the deposited clear water to the artificial sightseeing lake and ensuring the lake water to be clear without large quantity of sediment deposition.