To realize the unmanned driving of sweeping and washing vehicles, this paper takes the 18t pure electric sweeping and washing vehicle as the research object and elaborates on its unmanned driving system technology. The sweeping and washing vehicle adopts a pure electric wire-controlled chassis, which is controlled based on CAN bus distributed technology. It is also equipped with domain controllers, push stream controllers, lidar, ultrasonic radar, high-definition cameras and other equipment, enabling the unmanned driving function. In addition, sanitation operation tasks can be assigned to the sweeping and washing vehicles and operation routes can be planned through the cloud control platform, which greatly improves the operation efficiency and driving safety of the sweeping and washing vehicles.