The utility model provides an integrated process of desulfurization and dust removal system, including the desulfurizing tower, the flue gas entry has been seted up to the bottom of desulfurizing tower, is provided with in the desulfurizing tower and sprays the layer, and the flue gas enters the mouth and sprays and is provided with flue gas flow straightener between the layer, and the exhanst gas outlet has been seted up at the top of desulfurizing tower, and exhanst gas outlet department is provided with wet -type electrostatic precipitator, has set gradually flue gas flow straightening grid and flue gas deflector between wet -type electrostatic precipitator and the exhanst gas outlet, be provided with a plurality of atomizing nozzle on spraying the layer, atomizing nozzle is one -way double -end structure nozzle, and atomizing nozzle includes nozzle body, symmetry and inclines to set up two jet orifices on the nozzle body relatively, be provided with clearance mechanism between flue gas flow straightening grid and the flue gas deflector, effectively avoid scale deposit, the flue of the liquid drop between two reactors to stop up and corrode, reduce system resistance greatly, can in time clear up the scale deposit on FLOWGUIDE GRILLE and the guide plate in addition.