<p>The purpose of the present invention is to provide a recycling method which achieves a high removal efficiency for a silicon component and an aluminum component and thus makes it possible to recover simply a polishing agent having polishing performance equivalent to that of a fresh polishing agent from a spent cerium oxide-based glass-polishing agent. A recycling method for recovering a polishing agent from a spent cerium oxide-based glass-polishing agent, including adjusting the pH of a spent cerium oxide-based glass-polishing agent slurry to 0.5 to 3.0.</p>
