Abstract: The roasting and regeneration of waste ozone catalyst used in the biochemical effluent treatment of a petrochemical wastewater for 5 years was studied. The results show that with the increase of the roasting temperature from 200 ℃ to 500 ℃,the removal effect of the regenerated catalyst for ozone catalysis on the biochemical effluent of petrochemical wastewater is gradually improved, and the TOC removal rate can reach 44.30% at 500 ℃,  further increasing the roasting temperature does not improve the TOC removal rate significantly. When the roasting time was 2, 3, 4 and 5 h, the efficiency of the regenerated catalyst in treating petrochemical wastewater showed a trend of increasing first and then decreasing with the increase of the roasting time, and the TOC removal rate was the highest when toasting time was 4 h. Under the same operating conditions, the TOC removal rate of the regenerated catalyst obtained under the optimized roasting condition (500 ℃;4 h) in the biochemical effluent of petrochemical wastewater can reach 77.46% of that of the new catalyst. The study also explored the correlation between organic matter in wastewater and the results of three-dimensional fluorescence test. The analysis showed that the integrated volume of fluorescence area can indirectly reflect the content of organic matter in petrochemical wastewater, and can indirectly reflect the catalytic performance of ozone regeneration catalyst. The study has shown that direct roasting can be used as an effective technical means to regenerate the activity of spent ozone catalysts.