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The invention provides a dry desulfurization dust removing technology method for catalytic cracking regenerated flue gas. The method comprises the steps that catalytic cracking flue gas is introducedin a moving bed desulfuration reactor, the catalytic cracking flue gas and a loaded desulfurization catalyst are subjected to the desulfurization reaction, oxysulfide in the flue gas is subjected to the catalytic reaction to produce metal sulfate, and the metal sulfate is adsorbed on the desulfurization catalyst; the desulfurization catalyst containing the metal sulfate is conveyed to a desulfurization catalyst reproducer, reductive regeneration gas is introduced in the reproducer, and after the metal sulfate on the desulfurization catalyst is reduced to metallic oxide, a part of purified fluegas is utilized for lifting the regenerated desulfurization catalyst into a dust elutriating apparatus through a catalyst lifter, and after dust is recovered through elutriation, desulfurization catalyst is conveyed into moving bed desulfuration reactor for recycling; regenerated acid gas containing hydrogen sulfide is introduced in a dry gas desulfurizer to produce sulphur. According to the method, the desulfuration and dust removal of the catalytic cracking flue gas can be effectively achieved, and the desulfurization rate reaches 99% or above.