Closed riverway water power station

The invention relates to the field of a power station, and discloses a closed riverway water power station. The closed riverway water power station comprises a dam arranged on an embankment, and a lifting control slot is formed in the bottom of the dam. A vertical-telescopic lifting hydraulic device is arranged in the lifting control slot, the lower end of the lifting hydraulic device is connectedwith a water-stop sheet, and the water-stop sheet contacts with the embankment in a sealing mode. A tightness control slots are respectively formed in the places, close to the river banks on the twosides, of the dam. Lateral-telescopic lateral hydraulic devices are arranged in the tightness control slots, and the lateral hydraulic devices contact with the river banks through lateral fixed support plate in the sealing mode. The rear part of a water pump communicates with a valve pipeline component, the valve pipeline component communicates with a water power generating room, and the water power generating room communi