The filtration activated carbon canister of the waste liquid system is equipped with a spiral core, so that the exhaust gas is spiralling up, and through the increase in the trajectory of the corresponding extension of the movement of the exhaust gas gas distance distance increase also increases the contact time between the exhaust gas and the activated carbon, the contact time is long so that the exhaust gas adsorption of the fuller to enhance the adsorption effect, and so that the discharged exhaust gas is cleaner.