The present invention provides a gas generator, an electrolysis device, for containing electrolyzed water and electrolyzing the electrolyzed water to generate a hydrogen-oxygen mixed gas； and a condense filter (6) coupled to the electrolysis device and used to filter impurities of the hydrogen-oxygen mixed gas, wherein the condense filter has a gas inlet via and a gas outlet via, the gas inlet via is coupled to the electrolysis device for receiving the hydrogen-oxygen mixed gas, and the gas outlet via is used to output the filtered hydrogen-oxygen mixed gas； wherein, the gas outlet via of the condense filter is capable to receive recharged water to flush the impurities back to the electrolysis device through the gas inlet via.
