Regenerative Thermal Oxidation Device is an efficient, energy-saving and environmentally friendly device for treating medium and high concentration organic waste gas. RTO regenerative thermal oxidizer oxidizes organic matter (VOCs) in waste gas into carbon dioxide and water at high temperature, thereby purifying waste gas and recovering the heat released when the waste gas is decomposed. The three-chamber RTO regenerative thermal oxidizer has a waste gas decomposition efficiency of more than 99% and a heat recovery efficiency of more than 95%, which can reduce operating costs.