Petroleum flue gas purification device

The utility model discloses a petroleum flue gas purification device which comprises a spraying box, an alkali liquor pool, a filtering box, an activated carbon filtering layer and a dust collecting box, a catalytic combustion box is fixed to the inner wall of the top of the filtering box through screws, and a second induced draft fan is fixed to the outer wall of the top of the filtering box through screws. An air outlet of the second induced draft fan is sleeved with a second smoke outlet pipe, an air inlet of the second induced draft fan is sleeved with a second smoke inlet pipe, the end, away from the second induced draft fan, of the second smoke outlet pipe is communicated with the catalytic combustion box, a first mounting hole is formed in the outer wall of the bottom of the catalytic combustion box, and a ventilation pipe is inserted into the inner wall of the first mounting hole. The catalytic combustion box can combust and purify organic waste gas in petroleum flue gas, the dust collection box remov