NOVELTY - Preparation of fuel gas using agricultural waste and organic garbage comprises: (a) preparing material, naturally drying agricultural waste and organic garbage, using the mixture or one of the mixture by any ratio as fuel; (b) producing fuel gas; initiating anoxycausis with a blower to produce combustible gas; (c) filtrating and purifying the fuel gas; the fuel gas produced in gas generator is automatically cooled and deposited through a buffer tank I, dust and tar in fuel gas are absorbed away when lead into a water filter; and (d) packing and storing with an explosion-proof air compressor.    USE - The process is useful for preparing fuel gas using agricultural waste and organic garbage (claimed).    ADVANTAGE - The preparation process is easy, has low cost, and has high fuel gas utilization rate. Moreover, the process produces 2.0-2.5 m3 of fuel gas out of every kg of material; where the thermal value of the fuel gas can reach 6000 KJ/m3. Additionally, it is energy saving, reduces emission, and converts waste into useful resource.    DETAILED DESCRIPTION - Preparation of fuel gas using agricultural waste and organic garbage, comprises: (a) preparing material, naturally drying agricultural waste and organic garbage until the water content of is less than or equal to 20%, using the mixture or one of the mixture by any ratio as fuel; where the agricultural waste comprises straws, peanut shells, melon seed shells and biological weeds, leaves, or branches; the organic garbage comprises waste paper, paper box, water chopsticks, waste plastic product, waste flax, or waste gloves; (b) producing fuel gas, where the fuel gas is automatically added in feeding port of the gas generator; the feeding process is carried out in an airtight, compactly-pressed condition; and the fuel is lighted up when flows to the bottom; initiating anoxycausis with a blower to produce combustible gas that contains carbon monoxide (CO), hydrogen gas (H2), methane (CH4), and CnHm, where CnHm is vaporous tar gas when heated and adhesive tar liquid when cooled; (c) filtrating and purifying the fuel gas; the fuel gas produced in gas generator is automatically cooled and deposited through a buffer tank I, dust and tar in the fuel gas are absorbed away when lead into a water filter, where it is lead into a spraying tank for further de-tarring; the tar and dust are discharged from the bottom of water filter and spraying tank and collected; and the fuel gas is finally absorbed, dried in a dry filter, de-tarring rate is 80-85%, purity of the fuel gas reaches national standard; separately assembling air inlet and outlet of the dry filter with 120 microns stainless mesh, mounting 120 microns pipe filter on the pipeline from the dry filter to explosion-proof air compressor; and (d) packing and storing with an explosion-proof air compressor, where the purified fuel gas is sent into a storage tank with a pressure of less than or equal to 0.45 MPa; when pressure inside the storage tank reaches 0.45 MPa, the air compressor automatically stops operating, blower of the gas generator stops as well, leaving fuel gas inside the gas generator in a smoldering state; when pressure inside the storage tank is less than 0.2 MPa, the air compressor starts operating, blower of the gas generator starts operating, the fuel gas is again normally burnt to produce gas; and the pipeline from exit of the air compressor to the pressure storage tank is mounted with a one-way valve for backfire protection, and the pressure of the fuel gas is lowered to 0.1-0.2 MPa before distributed to gas network.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the equipment used in preparing fuel gas using agricultural waste and organic garbage.