Abstract: Heavy metal pollution has the characteristics of wide sources and great harm. This study attempts to use power plant waste (fly ash, slag) and dewatered sludge to prepare efficient and inexpensive ceramic adsorbent. Through adsorption influencing factor experiments, desorption regeneration experiments, adsorption kinetic model and adsorption isotherm model fitting, and ceramsite characterization analysis, the adsorption characteristics of ceramsite for Pb²⁺ are explored, and at the same time, new ideas are provided for the realization of waste resource utilization. The results showed that the optimal conditions for Pb²⁺ removal by ceramic granules were as follows: particle size 4 mm, pH 4.5-5.0, adsorption time 360 min, adsorption temperature 25 °C. The best conditions for the regeneration of ceramsite was 0.5 mol/L HCl solution, and the best desorption time and times were 120 min and 5 times, respectively. The removal rate of Pb²⁺ by the ceramsite after 5 times of regeneration was 92.67%. The adsorption process followed the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model. The O-H, Si-O and metal oxidation bonds on the ceramsite played a major role in the adsorption of Pb²⁺. After the ceramsite adsorbed Pb²⁺, Pb₂Cl₃OH and PbO formed. Chemical adsorption occurred between the ceramsite and Pb²⁺, which was a spontaneous exothermic reaction. The removal rate of Pb²⁺ in the actual wastewater treated by ceramide could reach 93.70%, and the concentration of Pb²⁺ decreased from 3.74 mg/L to 0.24 mg/L. The study showed that the composite ceramic had a certain removal effect on Pb²⁺, which provided data support for the application of adsorbent prepared from solid waste in the treatment of heavy metal wastewater.