Biological or chemical purification is used. The cleaning and spraying system adopts low-pressure pipeline design, large flow centrifugal pump and non blocking nozzle to ensure the purification efficiency. The ammonia removal rate is greater than 70% - 95%, the odor removal rate is greater than 40% - 75%, and the dust removal rate is greater than 45% - 80%, which can effectively restore the surrounding air environment of the farm.