The utility model discloses an install in dust removal defroster of desulfurizing tower, it includes a plurality of coordination's module, each the module is all including being cylindrical casing, the casing be equipped with the air inlet that is used for admitting air, be used for the gas outlet of giving vent to anger and be located the air inlet and the gas outlet between airflow channel, be equipped with among the airflow channel and be used for making the flue gas to form the whirl component of whirl, the utility model discloses an install in dust removal defroster of desulfurizing tower, the flue gas that gets into airflow channel during through the whirl component its airflow direction obtain the change with speed, little water droplet and small particulate matter in the flue gas form the torrent within a definite time and fully clash into each other, collide mutually and reunite into big liquid drop, big liquid drop contacts and forms the liquid film with shells inner wall and whirl component surface, the liquid film flows along the whirl component, it promptly can desorption fine particle and droplet to need not increase dominant exterior and material consumption, it is low to have the pressure loss, the characteristics that the effect is high, investment and running cost are lower, and is suitable for popularization and use.