The invention discloses a 
system for treating dust-containing 
tail gas; the 
system comprises a 
combustion-dust removal-dust collection device, which comprises a 
combustion section, which is provided with a dust-containing 
tail gas inlet, a 
combustion support gas inlet, and a heat source; a dust removal section, which is connected with the combustion section and provided with an annular 
pipe, wherein a plurality of holes facing the inner wall of the dust removal section are evenly distributed in the circumferential direction of the annular 
pipe; a dust collection section, which is connected with the dust removal section and provided with filler, a liquid atomizer and a dust-collected gas outlet, wherein the liquid atomizer is located above the filler, and the dust-collected gas outlet is located above the liquid atomizer; a 
slurry outlet which is connected with the dust removal section and the dust collection section; a pH regulating device, which is provided with a 
slurry inlet, a 
slurry outlet after slurry mixing, a pH 
regulator inlet and a pH 
detector, and the slurry outlet extends below the liquid level of the pH regulating device; a liquid-
solid separation device, which is provided with a 
filter element, a mixed slurry inlet, a 
slag slurry outlet and a filtered liquid outlet, and the filtered liquid outlet is connected with the ring 
pipe and the liquid atomizer; and a gaspurification device, which is provided with an adsorption layer, a dust-collected gas inlet and a purified gas outlet.