This application embodiment demonstrates a PTA oxidized -tail -gas purifies and bromine recovery unit, to the volatile organic compounds catalytic oxidation among the PTA oxidized -tail -gas in heat accumulation formula catalytic oxidation reactor to the heat recovery of heat accumulation formula catalytic oxidation reactor self tail gas after can the realization response. Reacted tail gas gets into HBr and br2 in the waste gas washing tower desorption tail gas through expander acting back. Adsorption saturation's washing liquid gets into the bromine recovery tower, utilizes chlorine or hydrogen peroxide solution to become bromine simple substance with the bromide ion oxidation, and then blows among the method water separation bromine through extraction or empty and carry out the bromine and retrieve, and this application embodiment demonstrates a PTA oxidized -tail -gas purifies and bromine recovery unit, and the running cost hangs down, high, the no secondary pollution of treatment effeciency, can realize the utilization of bromine in the pollutant moreover simultaneously.