Based on the analysis of the existing problems of dust control in open coal yards，the importance of dust suppression by watering in open coal yards is discussed.A mobile intelligent water curtain system for storage yard has been developed，which can realize large-scale walking，large capacity water storage，automatic source searching and water supplement，quantitative and accurate watering on the surface of coal pile.The system adopts the integrated design with the large-scale mobile single machine of the storage yard，uses the cantilever of the mobile single machine to establish the boom spray system and realize the full coverage and uniform sprinkling on the surface of the coal stack，and combines with the sprinkling pipe network of the spray gun of the storage yard to realize the automatic source searching and water replenishment of the water supply unit at multiple fixed water intake points.The results of engineering application show that the mobile sprinkler system greatly improves the clean production level of the yard，effectively inhibits the dust emission of the yard，and realizes the efficient water sprinkling on the surface of the coal stack at all seasons，which provides a new reliable technical method for the coal dust pollution control of large open storage yard.