The invention provides a pressure type atomizing nozzle convenient for backwashing large-particle impurities, and belongs to the technical field of environment-friendly dust settling equipment. The atomizing nozzle comprises a nozzle inner core and a nozzle outer sleeve, and is characterized in that the nozzle outer sleeve and the nozzle inner core are arranged to be cylindrical, and the nozzle outer sleeve sleeves the outer side of the nozzle inner core; a nozzle is arranged at the front end of the nozzle inner core, the rear end of the nozzle inner core is of an open structure, a set of positioning handles are symmetrically arranged on the outer wall of the nozzle inner core, and first through holes are formed in the outer wall of the nozzle inner core in the circumferential direction. Two ends of the nozzle outer sleeve are open, a set of spiral sliding ways matched with the positioning handles are arranged on the outer wall of the nozzle outer sleeve, the set of spiral sliding waysare arranged to be of a central symmetry structure, the positioning handles penetrate through the spiral sliding ways and can slide in the spiral sliding ways around the axis of the nozzle inner core, and second through holes corresponding to the first through holes are formed in the outer wall of the nozzle outer sleeve. Moreover, the atomizing nozzle is convenient to clean and simple in structure.