NOVELTY - Preparing combustible gas using city daily garbage and plant waste, by mixing and crushing city daily garbage and plant waste, transferring mixture to synthetic tower portion (1), cracking mixture, introducing obtained gas in water filter tank (13), cooling gas entering filter tank, converting tar substance in mixed gas into liquid, flowing out liquid, filtering the gas using carbon dioxide filter (14), sponge filter tank (15), palm leaf filter tank (16) and active carbon filter tank (17), pumping in gas storage tank (19), and storing gas.    USE - The method is useful for preparing combustible gas.    ADVANTAGE - The method saves energy, and is environmentally-friendly.    DETAILED DESCRIPTION - Method for preparing combustible gas using city daily garbage and plant waste, involves mixing and crushing city daily garbage and plant waste, transferring the mixture to a synthetic tower portion (1), cracking the mixture at 1100-1200 degrees C, introducing the obtained gas in a water filter tank (13) using a water seal movable observer (12), cooling the gas entering the filter tank to 25-35 degrees C using normal-temperature water, converting the tar substance in the mixed gas into the liquid, sinking the liquid to bottom of the water filter tank, flowing out the liquid from the tank, introducing the gas filtered by the water filter tank in a carbon dioxide filter (14) containing lime water, supplying water using a pump, removing carbon dioxide from the mixed gas, cooling the gas to 20-30 degrees C, filtering the produced gas filtered by carbon dioxide filter using a sponge filter tank (15), introducing the filtered gas in a palm leaf filter tank (16), filtering the filtered gas using an active carbon filter tank (17), pumping in a gas storage tank (19) using a vacuum pump (18), and storing the gas.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of device for preparing combustible gas.    Tower portion (1)    Clamping sleeve (2)    Second material storehouse (3)    Mixer (4)    High-temperature rotary heating portion (5)    Residue outlet propeller (6)    First material storehouse (7)    Switch (8)    Conveyor belt (9)    Water seal movable observer (12)    Water filter tank (13)    Carbon dioxide filter (14)    Sponge filter tank (15)    Palm leaf filter tank (16)    Carbon filter tank (17)    Vacuum pump (18)    Gas storage tank (19)