NOVELTY - Preparation of biological mixed alcohol comprises: (1) pre-crushing biomass and coal ash raw materials to 3-10 mm particle diameter; (2) directly gasifying biomass particle by pressing at 800-1000 degrees C and 1.0-2.5 MPa using oxygen and vapor in circulating mobile bed gasifier, and combusting organic part and gasifying remnant of the biomass while scattering heat to produce gas comprising hydrogen (H2) and carbon monoxide (CO); (3) refining and reforming gas; and (4) reacting the refined combined gas and mixed alcohol with rare earth compound cuprum catalyst.    USE - Preparation of biological mixed alcohol (claimed).    ADVANTAGE - The process emits less carbon dioxide (CO2) at 24% of that in the process using natural gas. The product has better combustibility.    DETAILED DESCRIPTION - Preparation of biological mixed alcohol comprises: (1) pre-crushing biomass and coal ash raw materials with less than 7 and 0.3 % moisture, respectively to 3-10 mm particle diameter; (2) directly gasifying the biomass particle by pressing at 800-1000 degrees C bed temperature and 1.0-2.5 MPa gasifier inner pressure using oxygen and vapor at 0.1-0.4 and 0.7-1.0 ratio with biomass, respectively, as gasifying agents in circulating mobile bed gasifier filled at the bottom with 40-500 umm diameter sand to a bed layer of three quarters - one half height of the gasifier and filling height of 1.5-2 times under the mobile function of gasifying agents, and combusting the 25-30 % organic part and gasifying 70-75 % remnant of the biomass material from thermal decomposition while scattering heat to produce the gas comprising hydrogen (H2) and carbon monoxide (CO); (3) refining by passing the gas through the moisture and draining devices to reduce coal ash and remnant moisture to less than 3 and 0.1%, respectively, and reforming by compressing the refined combined gas at not less than 2.8 MPa. The combined gas comprising material gas and mixed alcohol reacts with the CO to produce the hydrogen and carbon dioxide at 250-300 degrees C with the volume ratio between carbon monoxide and hydrogen controlled at 1:2-1:3; and (4) reacting the refined combined gas and mixed alcohol from the combing tower filled with rare earth compound cuprum catalyst at 200-380 degrees C and 6-12 MPa and 103 to 104 per hour space velocity.