The invention provides a gas phase and liquid phase compound reaction chemical luminescence detecting device, which includes optical detecting part, reacting chamber, its character lies in: one chamber is connected to the reaction chamber, the gas chamber is arranged with a gas phase inlet, the reaction chamber is arranged with a liquid phase inlet, and there assembles a micro aperture filtering film between the gas chamber and the reaction chamber. Based on the original reaction chamber, the air is filled into the gas chamber with a fixed pressure, and flows into the reaction chamber through the micro aperture, and it is joined with liquid phase in the area, thus the reaction efficiency is high.