Dirt suction system for cleaning device

The utility model provides a dirt suction system for a cleaning device, the cleaning device comprises a cleaning part and a water suction scraper, and the dirt suction system comprises a first fan, a second fan, a third fan and a fourth fan, the first sewage tank is used for storing sewage; the first pipeline comprises a first air blowing pipe, a first air suction pipe and a first sewage suction pipe, the first air blowing connector is communicated with one end of the first air blowing pipe, the first air suction pipe is connected between the first air suction connector and the first sewage tank, and the first sewage suction pipe is connected between the first sewage tank and the cleaning component; the second sewage tank is used for storing sewage; the second fan is provided with a second air blowing connector and a second air suction connector; the second pipeline comprises a second air blowing pipe, a second air suction pipe and a second sewage suction pipe, and the second sewage suction pipe is connected