The invention discloses a domestic portable oxygen producing-sterilizing-purifying machine. The domestic portable oxygen producing-sterilizing-purifying machine comprises an air suction port and a cooling chamber, and is characterized in that the right lower end of the air suction port is connected with a filtering device; a compressor is arranged at the bottom of the filtering device; molecular sieve barrels are arranged on the right side of the compressor; a purifying device is arranged at the upper end of a sterilizing device; a humidifier is arranged at the lower end of the purifying device; a fumigating device is arranged on the right upper side of the humidifier; cooling devices are arranged at the bottom end of a nitrogen gas outlet; universal wheels are arranged below the cooling devices; a storage battery is fixed behind a motor. The domestic portable oxygen producing-sterilizing-purifying machine is provided with four molecular sieve barrels, so that the problem of low oxygen producing amount can be solved; the cooling devices are arranged in the machine, so that the problem of severe heating during use of the machine can be solved; a pull rod is arranged outside an oxygen producer, the universal wheels are arranged at the bottom, and the fumigating device is arranged inside, so that the released oxygen has pleasant flavor.