NOVELTY - Biogas system comprises dry fermentation mechanism (1), wet fermentation mechanism (2), folding storage airbags (3), greenhouse sunlight (4) and stuffy solar water heaters (5). The dry fermentation mechanism comprises two fermentation tank, where one is filled with liquid material and disposed within the annular solar greenhouse fermentation tank and other is filled with number of materials, which get soaked in net cage. The net cage (12) is provided seal cover (13) on its top. Upper side wall of the dry fermentation tank is provided with first gas-guide tube.    USE - Biogas system.    ADVANTAGE - The biogas system solves problem of clogging sludge, and is energy-conservative as it utilizes combination of solar energy and greenhouse, and improves methane content of biogas.    DETAILED DESCRIPTION - Biogas system comprises dry fermentation mechanism, wet fermentation mechanism, folding storage airbags, greenhouse sunlight and stuffy solar water heaters. The dry fermentation mechanism comprises two fermentation tank, where one is filled with liquid material and disposed within the annular solar greenhouse fermentation tank and other is filled with number of materials, which get soaked in net cage. The net cage is provided seal cover on its top. Upper side wall of the dry fermentation tank is provided with first gas-guide tube. The wet fermentation machine comprises coaxial set, which is present in the middle of the tank. The wet fermentation machine is connected to the dry fermentation machine through coaxial set. One of the coaxial is provided with heat exchanger and other is fixed with biofilm. The wet fermentation machine is provided with second gas-guide tube on the top. Lower portion of side wall of the wet fermentation machine is provided discharge tube. The folded air bag is provided on top of the wet fermentation machine and is connected to second gas-guide tube. The stuffy solar water heaters provides hot water to the heat exchanger.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the biogas system.    Dry fermentation mechanism (1)    Wet fermentation mechanism (2)    Folding storage airbags (3)    Greenhouse sunlight (4)    Stuffy solar water heaters (5)    Net cage (12)    Seal cover (13)