To suppress sticking of acidic water content and a gypsum component contained in slurry to an exhaust fan and the inside of an exhaust pipe and to prevent equipment from corrosion, failures or the like when dust is wet-collected from a cement kiln extraction gas.

This system 1 for treating a cement kiln extraction gas is equipped with: a probe 6 for cooling a portion of a combustion gas while extracting it from a kiln exhaust gas channel ranging from the inlet of a cement kiln 5 to a lowermost stage cyclone; a cyclone 10 for separating a coarse powder D1 from the extraction gas G1 extracted by the probe 6; a high temperature bag filter 11 for subjecting an exhaust gas G2 containing a fine powder D2, exhausted from the cyclone 10, to a solid-gas separation; a wet dust collector 15 for removing residual dust and sulfur content contained in an exhaust gas G3 of the high temperature bag filter 11 and at the same time, washing the fine powder D2 with water; and a heat exchanger 13 for performing heat exchange between the exhaust gas G3 from the high temperature bag filter 11 and a clean gas G5 from the wet dust collector 15.

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