Sewage suction ship for underwater dredging of hydropower station tail water channel

The utility model discloses a sewage suction ship for underwater dredging of a hydropower station tail water channel. The sewage suction ship comprises a ship body, a lifting plate, a lifting mechanism, a soil loosening mechanism and a sewage suction mechanism. The soil loosening mechanism comprises a soil loosening part and a first telescopic driving part; and the sewage suction mechanism comprises a sewage suction head, a second telescopic driving piece, a sludge tank and a sewage suction pump. According to the technical scheme, the soil loosening device has the advantages that the lifting plate is driven by the lifting mechanism to move downwards to enable the soil loosening piece to approach the water bottom, then the first telescopic driving piece drives the soil loosening piece to move downwards to enable the soil loosening piece to be inserted into sludge at the water bottom, and meanwhile the second telescopic driving piece drives the sludge suction head to be inserted into the sludge. According to th