In order to find a low-cost absorbent material to treat the wastewater containing 2，4，6-trinitrotoluene （TNT），the activated coke （AC） prepared from lignite is used to adsorb the wastewater containing TNT，and the kinetics and thermodynamics of AC，and the differences of AC surface and DSC-TGA before and after adsorption are studied.The results show that the adsorption kinetics of AC adsorbing TNT conforms to the pseudo-second order kinetic model，and the intraparticle diffusion of TNT onto AC is identified to be the rate limiting step.The adsorption process of TNT by AC is an endothermic process，and mainly chemical adsorption process.The Redlich-Peterson isotherm model is more suitable to fit the adsorption process of TNT by AC.When the concentration of TNT is 98.8mg/L，the dose of AC is 2.5g/L，pH is neutral，the temperature is 40℃，and the oscillation period is 360min，99.4% of TNT can be removed.The surface pores of AC are blocked after adsorbing TNT.The peak temperature of DSC-TGA decreases from 546.5℃ to 521.5℃，and its heat flow increases from 178.5mW to 209.6mW.