The utility model provides an oxygen tree, which is an emulational flower or an emulational plant for eliminating waste gases (carbon dioxide, sulfur dioxide and the other acid gases) and generating oxygen to keep the fresh air in a relatively closed room. The utility model comprises a pot and an emulational plant extends from the pot, and is characterized in that: a containing chamber is positioned in the pot. An air duct, which is communicated with the inside and outside, and super-oxide kalium, which is taken as the oxygen generating agent, are arranged in the containing chamber. Through further improving the utility model, the color flickering rendering light source can be provided by the oxygen tree at night through taking the solar energy as the energy source, and the lighting at night without electric network and electric energy is realized at the same time. The utility model has the advantages of energy saving, environmental protection and convenient movement.