The invention discloses a waste gas purification method. The waste gas purification method comprises the step of enabling soot waste gas to be in contact with a waste gas purifier, wherein the waste gas purifier is prepared from the following raw materials: sodium dodecyl benzene sulfonate, nonylphenol polyethylene ether, isopropanol, triethanolamine, sodium silicate, citric acid, polyether modified silicon oil, modified kapok fiber, nano aluminum oxide and water, a mass ratio of the polyether modified silicon oil to the modified kapok fiber to the nano aluminum oxide is (2 to 4):(5 to 10):(1to 3), the modified kapok fiber is obtained by treating kapok fiber by using hydrogen peroxide, and the surface tension of the waste gas purifier is 18 to 32 dyne/cm. Compared with the prior art, themaximum oil stain adsorbing capacity and the adsorption rate of a product treated by the waste gas purification method disclosed by the invention are further improved.