NOVELTY - Solar energy utilization system comprises e.g. a collecting device (1) used for focusing sunlight. The light collecting device is set with a double-layer reaction sleeve (2) and also includes an outside sleeve tube (13) and an oxygen permeable membrane sleeve (16). The oxygen permeable membrane sleeve is formed within an inner chamber. The outside sleeve tube and the oxygen permeable membrane sleeve together formed between outer chambers. The inner chamber and the outer chamber are used to introduce oxygen and fuel gas in a reaction chamber to produce reaction gas.    USE - Used as solar energy utilization system.    ADVANTAGE - The solar energy utilization system is converts low-grade solar energy into high-grade chemical energy and utilizes chemical energy to generate electricity, and to improve energy efficiency.    DETAILED DESCRIPTION - Solar energy utilization system comprises a collecting device (1) used for focusing sunlight. The light collecting device is set with a double-layer reaction sleeve (2) and also includes an outside sleeve tube (13) and an oxygen permeable membrane sleeve (16). The oxygen permeable membrane sleeve is formed within an inner chamber. The outside sleeve tube and the oxygen permeable membrane sleeve together formed between outer chambers. The inner chamber and the outer chamber are used to introduce oxygen and fuel gas in a reaction chamber to produce reaction gas. A chemical potential difference is set between the oxygen permeable membrane sleeve and the reaction chamber and also and set with a power generation device which is used to generating fuel gas for power generation using decomposing reaction. The collecting device is used to focus sunlight to generate heat. Introduced reaction gas into the reaction chamber and decomposes under the effect of the heat. The obtained oxygen in the chemical potential difference under the action decomposition reaction passes to an oxygen permeable chamber via oxygen permeable membrane sleeve, then carrying out decomposition reaction in the reaction chamber to generate power.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the solar energy utilization system.    Collecting device (1)    Double-layer reaction sleeve (2)    Fuel cell (12)    Outside sleeve tube (13)    Oxygen permeable membrane sleeve (16)