The modified honeycomb coal burnt cinder was used to remove Congo Red (CR) dye from wastewater as an adsorbent. The scanning electron microscope was used to analyze the morphology of the cinder before and after modification. The adsorption thermodynamics and kinetics of CR on the modified honeycomb cinder were studied. The adsorption isothermal data fitted to the Langmuir, Freundlich, and Tempkin equations. The results show that the modified honeycomb cinder has a good adsorption capacity for CR, the adsorption process agrees well with the Langmuir model (RC2≥0.9979). The equilibrium adsorption capacity of CR is 80.64, 92.59 and 108.7 mg/g at 25, 35 and 45℃, respectively. The adsorption process can be described by a pseudo-second-order kinetic model (RC2≥0.9961), the activation energy is 22.87 kJ/mol and the adsorption process shows physical adsorption. The adsorption rate is controlled by both surface and intraparticle diffusions. The adsorption processes is spontaneous and endothermic.