Drench sludge treatment system and treatment method

The invention relates to the technical field of sludge treatment, in particular to a ditch dredging sludge treatment system and method. The ditch dredging sludge treatment system comprises a first screening device, a sludge crushing device, a second screening device, a third screening device, a fourth screening device, a fifth screening device, a water return device and a clean water tank; the first screening device, the sludge crushing device, the second screening device, the third screening device, the fourth screening device and the fifth screening device are sequentially connected, the water return device is connected with the fifth screening device, the clean water tank is connected with the water return device, and the clean water tank is connected with the sludge crushing device. And the first screening device, the second screening device, the third screening device and the fourth screening device are all connected with the clean water tank. The sewer sludge treatment system and treatment method provid