China is the world's largest consumer of rubber, the annual production of more than 400million waste tires. Pyrolysis of waste tyre is a recycling route with high value-added and environmentally friendly. The higher color of dye wastewater has a serious impact on the ecological environment. In this paper, H₂SO₄ and NaOH were used to modify the pyrolytic carbon black of waste tire. The experimental results showed that when the ratio of carbon black to H₂SO₄ was 1g/15mL, the best decolorization rate of acid lake blue solution was obtained over HBC. Also, NBC obtained with the ratio of carbon black to NaOH 1g/10mL was good for treating basic lake blue solution. The stronger the acidity of the solution, the better the decolorization effect of HBC on the acid lake blue solution. On the contrary, the stronger the alkalinity of the solution, the better the NBC on the basic lake blue solution. In addition, the adsorption process of acid lake blue over HBC and alkaline lake blue over NBC was very close. The whole adsorption reaction was very fast. After 20min, the adsorption equilibrium was basically reached. The adsorption process of acid lake blue over HBC and alkaline lake blue over HBC conform to the pseudo second-order kinetic equation. The properties of scanning electron microscope, infrared spectrum and specific surface area of solid materials before and after modification were analyzed.