NOVELTY - Device for using organic waste to prepare vehicle fuel gas, comprises a pre-treating pool, a heating device, a material feeding pump, a primary anaerobic fermenting device, a secondary anaerobic fermenting device, a desulfurization device, an absorbing tower, a regeneration tower, a cooling device, a drying device, a compressing device, an air-entrapping rod, a torque device and a dry flexible double-film gas cabinet. The material outlet of the pre-treating pool is connected with the material inlet of the material feeding pump.    USE - Used as a device for using organic waste to prepare vehicle fuel gas.    ADVANTAGE - The purified marsh gas combustion value is greater than the standard of the vehicle fuel gas. The method is simple. The device and method are environmental friendly.    DETAILED DESCRIPTION - Device for using organic waste to prepare vehicle fuel gas, comprises a pre-treating pool, a heating device, a material feeding pump, a primary anaerobic fermenting device, a secondary anaerobic fermenting device, a desulfurization device, an absorbing tower, a regeneration tower, a cooling device, a drying device, a compressing device, an air-entrapping rod, a torque device and a dry flexible double-film gas cabinet. The material outlet of the pre-treating pool is connected with the material inlet of the material feeding pump. The material outlet of the material feeding pump is connected with the primary anaerobic fermenting device. A stirring device, a material overflow port and a first gas outlet are formed in the primary anaerobic fermenting device. The heating device is used for heating the primary anaerobic fermenting device through a tube. The material overflow port is connected with the secondary anaerobic fermenting device. The first gas outlet is connected with the secondary anaerobic fermenting device through a tube. The second anaerobic fermenting device is equipped with a second gas outlet. The second gas outlet is connected with the gas inlet of the desulfurization device. The gas outlet of the desulfurization device is connected with the gas inlet of the absorbing tower through a tube. The gas outlet of the absorbing tower is connected with the gas inlet of the cooling device through a tube. The absorbing tower is connected with the regeneration tower through an enriched liquid pump. The regeneration tower is connected with the absorbing tower through a pool pump. The gas outlet of the cooling device is connected with the drying device. The drying device is connected with the compressing device through the flexible gas cabinet. The compressing device is connected with the air-entrapping rod. An INDEPENDENT CLAIM is also included for preparing the vehicle fuel, comprising: (i) preparing fermenting substance by crushing big blocks of organic substances and removing the inorganic substances, and spreading the organic waste having solid content of 8-12%; (ii) conveying the fermented substance into the primary anaerobic fermenting device, performing anaerobic fermentation on the fermented substance at high temperature or middle temperature to generate biogas, where the temperature of the high temperature fermentation is 53-57 degrees C and the fermenting time is 15-20 days, and the temperature of the middle temperature fermentation is 31-35 degrees C and the fermenting time is 20-25 days, controlling the pH of the two fermenting methods at 6.8-7.4; (iii) passing the generated biogas into the desulfurization device to remove the hydrogen sulfide from the biogas until the volume concentration of the hydrogen sulfide is smaller than 50 ppm; (iv) passing the generated gas in the step (iii) into the absorbing tower, passing the absorbing agent solution in the absorbing tower to remove carbon dioxide and little hydrogen sulfide of the biogas to obtain pure biogas; (v) cooling and drying the obtained biogas in the step (iv) through the cooling device and the drying device, passing the pure gas into the flexible gas cabinet to be stored or directly conveying the pure biogas to the prizing trolley or the fuel gas vehicle through the compressor and the air-entrapping rod; (vi) the absorbing agent solution which absorbs carbon dioxide in the step (iv) is enriched liquid, passing the enriched liquid to the regeneration tower to separate carbon dioxide and little hydrogen sulfide of the enriched liquid to obtain the pool liquid which can absorb carbon dioxide.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the device for using organic waste to prepare vehicle fuel gas.