The invention relates to the field of sanitation mechanical equipment. To solve the problems that in the prior art, a sweeper is high in water consumption and prone to producing secondary air pollution, a road sweeper with a sewage cycling dustfall device is invented by the inventor. The road sweeper includes a road-sweeping device, a dustfall device and a garbage-collecting device. The road-sweeping device includes a sweeping chuck and a driving device. The garbage-collecting device includes a dustbin, a negative pressure fan and an induced draft channel. The negative pressure fan communicates with the dustbin and the induced draft channel. The dustfall device includes a clean-water tank, a first water pump, a first nozzle and a sewage tank. The first nozzle is connected with the clean-water tank by a pipeline and the first water pump and faces the road or the sweeping chuck. The sewage tank is connected with the induced draft channel through a pipeline to settle dust for the in-car air by importing sewage to the induced draft channel and the dustbin. According to the technical scheme, by importing sewage to the induced draft channel to settle dust for the in-car air, sewage is effectively used, the clean water usage amount is reduced, and the secondary air pollution caused by air dust blown by cars can be prevented.