The invention discloses a method for purifying the benzene pollutants in wastewater, which comprises the steps of feeding butagas with the concentration of above 80% into the wastewater for bubbling and intense churning under normal atmosphere with the gas feed rate of 6ml/min to 114ml/min for 5 to 45 minutes. The purifying method can be applied in the industry to purify the wastewater containing benzene, and compared with the prior steam stripping purifying technology and air stripping purifying technology, the method has the advantages of simple operation, safety, high gas stripping efficiency, prominent purifying effect and suitability for high-purity purification of wastewater containing benzene. The method can fully utilize the butagas resource in most domestic refineries, exploit the new industrial value of the butagas, reduce the pressure on the microbe treating ponds for purifying wastewater containing benzene, minimize the treatment cost for environmental protection and enhance the economic benefits of the equipment.