Abstract: A negative ion air purification and lighting device consisting of a negative ion generator disposed in between the tubular elements of an energy-saving light tube and, furthermore, a carbon fiber brush protruding from the negative ion generator. When the energy-saving light tube is switched on, a voltage amplification circuit is simultaneously enabled to output a high voltage of 2.5 kV at the tip of the carbon fiber brush—though the current is so minute that there is no danger to the human body. As a result, the ions in the high voltage are utilized to break down ions in the air into positive and negative ions. The heavier positive ions are absorbed by the carbon fiber brush and, furthermore, recycled as current via a wire, but the lighter negative ions are convected against dust sediment such that microscopic particulate, bacteria, and viruses cannot subsist in the air, thereby purifying indoor air, while the negative ions also have an invigorating effect on human body cells.