Catalytic cracking flue gas particulate matter ultralow emission control device

The invention discloses a catalytic cracking flue gas particulate matter ultralow emission control device, which relates to the technical field of chemical waste gas emission pretreatment, and comprises a desulfurization and dust removal tower and an external power supply, the desulfurization and dust removal part is used for removing sulfides in the flue gas; the coarse dedusting and demisting part is used for dedusting after desulfurization and dedusting; the fine dedusting and demisting part is used for secondary dedusting and demisting after the coarse dedusting and demisting part; and the demisting and dewatering part is used for removing small liquid drops in saturated wet flue gas formed after flue gas desulfurization. The device has the advantages that by means of the four-section cascade cooperative dedusting and demisting arrangement of the Venturi tube bundle for desulfurization and dedusting, coarse dedusting and demisting, fine dedusting and demisting and demisting and dewatering, the content of