A cutter suction dredger uses a rotating cutter to loosen the soil at the bottom of a river or sea, mix it with cement to form a slurry, which is then sucked into the pump body through a suction pipe and sent to the discharge area through a discharge pipe. During the construction of a cutter suction dredger, dredging, mud transportation, and unloading are all integrated and completed independently, resulting in high production efficiency. Suitable for dredging in inland lake areas and coastal ports with low wind and wave speeds, it is more suitable for excavating soil such as sand, sandy loam, and silt. A toothed cutter can be used to excavate clay, but the efficiency is relatively low.