The hydrogen oxygen fuel cell demonstrator is an experimental device used in biology and chemistry teaching, mainly used to demonstrate the working principle and energy conversion process of fuel cells. This demonstrator typically consists of two electrodes (anode and cathode), an electrolyte membrane, and a supply system for hydrogen and oxygen. In biology teaching, a hydrogen oxygen fuel cell demonstrator can help students understand how microorganisms generate electricity through metabolic processes. Students can understand how fuel cells convert chemical energy into electrical energy, as well as the energy conservation and conversion efficiency in this process, by observing the reaction of hydrogen and oxygen on the electrode.