Autoclaved aerated concrete (AAC) is a porous hollow material (total porosity > 70%), with a chemical composition rich in calcium and metals (Fe, Al, K, Mg). AAC material shows potential as an effective adsorbent for heavy metals, especially Cd in wastewater. The process of industrialization in the construction industry and the downward trend, of not using traditional calcined materials has increased the production scale and application of AAC materials, thereby generating hundreds of thousands of cubic meters of AAC waste. Therefore, the reuse of AAC waste for wastewater treatment purposes is of great practical significance when solving the problem of solid waste management and pollution control. This study tested AAC as an adsorbent to remove Cd(II) from wastewater. Static adsorption experiments were performed using AAC waste concrete with 2 different sizes (3–5 mm and 5–10 mm) to treat synthetic wastewater, in which Cd(II) concentration was varied from 0– 5000 mg/L, in different reaction times. The research results have determined the adsorption kinetic parameters according to the Langmuir model and the Cd(II) adsorption capacity of AAC up to 9,26 mg/g, thereby demonstrating that AAC can be used as a low-cost, effective, friendly, sustainable adsorbent material in removing Cd(II) in wastewater.