NOVELTY - A composite biomass liquid fuel contains 50-60% biomass pyrolysis liquid, 20-30% 6-8 carbon containing alkane, 10-20% 2-4 carbon-containing monohydric alcohol mixture, 0.5-1.5% polymerization inhibitor, 0.5-1.5% emulsifying agent, and 0.1-0.3% antiknock agent obtained by mixing under pressure at room temperature for 6 hours in which biomass pyrolysis liquid is prepared by drying biomass feed stock, crushing, subjecting to heat cracking reaction in quick pyrolysis reactor, and collecting condensed liquid.    USE - Composite biomass liquid fuel for kerosene, heavy oil, and fossil fuel alternatives.    ADVANTAGE - The composite biomass liquid fuel is environment-friendly, safe, convenient to store and transport, and has high calorific value and stability.    DETAILED DESCRIPTION - A composite biomass liquid fuel contains 50-60% biomass pyrolysis liquid, 20-30% 6-8 carbon containing alkane mixture, 10-20% 2-4 carbon-containing monohydric alcohol mixture, 0.5-1.5% polymerization inhibitor, 0.5-1.5% emulsifying agent, and 0.1-0.3% antiknock agent obtained by mixing under pressure at room temperature for 6 hours in which biomass pyrolysis liquid is prepared by drying biomass feed stock i.e. wood waste product, wood meal produced from wood processing, wheat straw, corn straw, sorghum straw, cotton stalks, rice straw, bean stalks, and/or peanut shells, crushing, subjecting to heat cracking reaction in quick pyrolysis reactor, and collecting condensed liquid, polymerization inhibitor is cuprous chloride, ferric chloride, hydroquinone, dinitrobenzene, and/or 2,5-di-tert.-butylhydroquinone, emulsifying agent is nonylphenol ethoxylate, benzyl phenol polyoxyethylene ether, polyoxyethylene stearyl ether, abietic acid polyoxyethylene ester, polypropylene glycol diglycidyl ether, diisopropylamide naphthalene sulfonate, bisphenol polyoxyethylene ether formaldehyde condensate and/or dodecyl trimethyl ammonium chloride, and antiknock agent contains 5 wt.% methylcyclopentadienetricarboxymanganese, 25 wt.% methylaniline, 30 wt.% isobutyl acetate, and 40 wt.% methyl tert.-butyl ether.