The oxygen generator adopts split structure, the main engine is started by radio remote control, and the oxygen generator is installed outdoors to separate nitrogen and oxygen from fresh air. It is connected to the indoor oxygen supply terminal through an oxygen supply conduit, filtered by an oxygen humidifier, and enters the indoor oxygen supply terminal to supply limited oxygen to the room, so that the indoor air is fresh and ventilated, the indoor air quality is improved, and the indoor oxygen content is increased. If the nasal oxygen tube is connected when inserting the oxygen mask with plug, two people can breathe at the same time. Outdoor oxygen generator is equipped with heating and heat preservation device, which can work at -30℃.