The invention relates to a purifying treatment technology of coke wet quenching steam. The purifying treatment technology comprises the following steps of sending the primarily purified steam in a coke wet quenching tower into a steam absorbing tower, fully touching and exchanging heat with industrial circulating water in a primary coiled pipe water cooler and a secondary coiled pipe water cooler, and draining condensate into a coke powder settling tank; sending the tail gas after heat exchange into a cyclone separator through a tail gas pipeline to be purified for the second time, and sending the separated dust, water droplets and other pollutants into the coke powder settling tank; sending the tail gas after secondary purifying into a tail gas treatment device, using the heat of high-temperature steam to heat the unabsorbed water steam and air in the tail gas to the unsaturating state, sending the separated dust, water droplets and other pollutants into the coke powder settling tank, emitting the heated tail gas through a chimney after the heated tail gas reaches standard, and avoiding production of white fog in the emission process. The purifying treatment technology has the advantages that the route is simple and rapid, and the investment cost is low; a large amount of high-temperature steam produced in the coke wet quenching process is fully purified, and the standard emission of the tail gas in the coke wet quenching process is realized, specially emission of no white fog.