The invention discloses a sludge drying tail gas treatment system and a sludge drying tail gas treatment method. The sludge drying tail gas treatment system comprises a sludge drying machine, an induced draft fan, a cyclone separator, a spray tower, an air blower, a sewage storage tank, a nitrification tank, a denitrification tank and an activated carbon absorption tower, wherein the sludge dryingmachine, the induced draft fan, the cyclone separator and the spray tower are sequentially connected in series; the spray tower is communicated with the nitrification tank through the air blower; thesewage storage tank, the denitrification tank, the nitrification tank and the activated carbon absorption tower are sequentially connected in series. The invention also correspondingly provides the sludge drying tail gas treatment method. The method comprises the following steps: carrying out chemical oxidation treatment on the tail gas, carrying out biochemical degradation, performing adsorbingwith activated carbon, and conducting discharging. According to the invention, the technical effects of treating the waste with the waste and cooperatively treating tail gas and waste water are finally achieved, up-to-standard discharge of sludge drying tail gas and waste water is realized, energy conservation and environmental protection are realized, secondary pollution is not generated, and meanwhile, the method also has the advantages of decreasing equipment occupied area and equipment maintenance workload and reducing equipment comprehensive operation cost.