NOVELTY - Preparation of fuel derived from combustible waste comprises: (i) sterilizing raw wastes by spraying lactic acid, (ii) selecting the waste manually, dividing, then taking the combustible substance as raw material, (iii) selecting the fine waste by crushing the combustible raw materials and removing the organic substances, (iv) adding calcium oxide and stirring, (v) preparing the material by adding combustion improver and adhesive, (vi) leaching the water and drying in hot air, (vii) molding, (viii) drying and cooling to obtain the finished product, and (ix) checking the heat value.    USE - The method is useful for preparing fuel derived from combustible waste.    ADVANTAGE - The method has high garbage selecting rate and efficiently controls the harmful substance in the derived fuel. The derived fuel: has high heat value, improved intensity, high production efficiency, high waste selecting rate and good quality; does not easily break; is economical, convenient to transport and store, and provided with calcium oxide for efficient sterilization and inhibiting the generation of dioxins and other harmful substances during combustion process.    DETAILED DESCRIPTION - Preparation of fuel derived from combustible waste comprises: (i) sterilizing the raw wastes by uniformly spraying lactic acid (0.5-1%) and stirring evenly, (ii) selecting the waste manually by picking out large pieces, crushing, sieving, and screening by gravity, air, magnetic separation and according to bore diameter, then dividing the waste into organic, inorganic, combustible substances, plastic, magnetic substance and metals, and then taking only the combustible substance as raw material for further use, (iii) selecting the fine waste by crushing the combustible raw materials into not larger than 6 mm material with a half wet crusher in a fine selector, then removing the organic substances and glass to obtain not less than 98% combustible fine material, (iv) adding calcium oxide (4-8%) to the combustible fine material and stirring uniformly, (v) preparing the material by adding combustion improver (10-20%) and adhesive (0.5-1%) and then mixing and stirring uniformly, (vi) leaching water of the fine material of combustible substance, drying in hot air at 60-90 degrees C till the water content is lower than 25%, (vii) molding by squeezing, (viii) drying in a furnace at 90-120 degrees C, and cooling to obtain a finished product having less than 15% of water, and (ix) checking the heat value of the fuel after reaching higher than 3000 kcal/kg as a qualified product.