Water mist dust suppression device of sweeping machine

The invention discloses a water mist dust suppression device of a sweeper truck. A water tank of the sweeper truck is connected with a dust suppression mechanism through a high-pressure water pump; an air duct plate is arranged at the bottom of a dust suppression box of the dust suppression mechanism, an air duct inlet is formed in the air duct plate, and a plurality of high-pressure atomizing nozzles are arranged above the air duct inlet at equal intervals; a dust cleaning part is arranged in the dust suppression box, a scraper of the dust cleaning part moves up and down along the dust suppression box, a bottom plate is movably arranged at the bottom of the dust suppression box, the bottom of the scraper is movably connected with the top end of a connecting shaft, the bottom end of the connecting shaft is movably connected with a sliding block, and a sliding groove matched with the sliding block is formed in the bottom plate. A filtering device is arranged on a pipeline for connecting the sweeper truck water