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This utility model relates to the technical field of dust removal equipment, and particularly to a dust suppression device for construction sites, comprising a mobile chassis, a lifting rod, an atomizing nozzle, a high-pressure water pump, a connecting hose, and a water inlet pipe. The lifting rod is mounted on the mobile chassis. The atomizing nozzle is installed at the top of the lifting end of the lifting rod, rising or falling with the top of the lifting end. The high-pressure water pump is mounted on the mobile chassis. The connecting hose connects the atomizing nozzle to the outlet of the high-pressure water pump. The water inlet pipe connects to the inlet of the high-pressure water pump. This utility model, by installing a lifting rod on a mobile chassis and mounting the atomizing nozzle at the top of the lifting end of the lifting rod, allows the atomizing nozzle to rise or fall with the lifting end of the lifting rod, thereby adjusting the height of the atomizing nozzle. This enables the atomizing nozzle to perform dust suppression not only at higher elevations but also at different heights.