This process adopts activated carbon adsorption desorption+catalytic combustion. The exhaust gas emitted by the lost foam process is discharged from the outlet of the water ring vacuum pump and the circulating water. After passing through the porous activated carbon adsorption performance and the high-temperature desorption performance of the activated carbon, the organic matter after desorption enters the catalytic combustion furnace and undergoes catalytic combustion at 300-400 ℃ to complete the treatment of the lost foam exhaust gas.