NOVELTY - Pyrolysis refining-fractionation directional transformation for biomass comprises pre-processing of biomass, thermally decomposing and refining, and directionally transforming the thermal decomposition product in fractionation. The residual solid in the thermal decomposition is thermal decomposition slag.    USE - Method for pyrolysis refining-fractionation directional transformation for biomass (claimed).    ADVANTAGE - The problem that lots of enzyme catalysts are used and the raw materials cannot be easily gathered, transported, or stored in the production with the biomass raw materials as the energy sources can be solved. An efficient and high-value utilization of biomass is provided.    DETAILED DESCRIPTION - Pyrolysis refining-fractionation directional transformation for biomass involves pre-processing or pre-processing the biomass raw material in combination to the particle raw material, putting the raw material into a thermal decomposition device to thermally decompose and refine in gradient, and automatically collecting the condensed thermal chemical transformation product by a collecting device in different steps to obtain a thermal decomposition oil comprising two fractions, water-soluble thermal decomposition oil and lipid soluble thermal decomposition oil. The water soluble thermal decomposition oil components are collected. The residual solid in the thermal decomposition is thermal decomposition slag. Biological transformation is conducted with the characteristic that the main ingredients of the water soluble thermal decomposition product are organic acids, including formic acid and acetic acid and the micro-molecular saccharides include cellobiose, glucose and fructose. Fermentation prepares methane, acetone butanol, and polyhydroxyalkonate. A high-quality biological oil is prepared as a fuel of the internal combustion engine and boiler with the characteristic that the combustion performance of the lipid soluble thermal decomposition oil is high. Active carbon or nano silicon dioxide with the characteristic that the thermally decomposed slag has high content of carbon and ash.