Abstract: After pretreatment and dilution，waste sulfuric acid from titanium white production was used for preparation of resorcinol by acidic hydrolysis of meta-phenylenediamine. The effects of transition metal salt catalyst，reaction temperature and time on the yield of resorcinol were investigated. A yield of 90.2% was achieved under the conditions of mole ratio of catalyst to sulfuric acid 0.008∶2，reaction temperature 220℃ and reaction time 9h. Post treatment process was modified to give a higher yield，lower energy cost and less wastes.The process featuresnot only reduction of waste release by reuse of waste sulfuric acid，but also significant economic benefits.