The invention discloses flue gas desulfurization equipment. The flue gas desulfurization equipment comprises an absorption tower (10) and a first flue (11) connected to the absorption tower (10). A first induced draft fan (12) of which the outlet faces the absorption tower (10) is arranged on the first flue (11), a first inlet isolation door (13) positioned at the inlet of the first induced draft fan (12), and a first outlet isolation door (14) positioned at the outlet of the first induced draft fan (12) are also arranged on the first flue (11), a first exhaust opening is arranged between the outlet of the first induced draft fan (12) and the first outlet isolation door (14), and the first exhaust opening is connected with a suction device used for sucking flue gas at the outlet of the first induced draft fan (12). The flue gas desulfurization equipment can solve the problem that the induced draft fan cannot be completely isolated, and thus flue gas reversely flees at the outlet.