NOVELTY - A straw liquefaction-separation method involves crushing straw e.g. food crop straw, oil crop straw, cotton straw, tobacco straw, hemp straw, and/or sugar crop straw, adding water, stirring and mixing to obtain straw pulp with solid:liquid ratio of 1:50-1:2, carrying out liquefaction reaction in high-pressure kettle at 140-350 degrees C and 0.1-20 MPa for 1-200 minutes, rapid cooling, performing solid-liquid separation on collected reaction mixture to obtain solid phase and aqueous phase, and extracting solid phase and aqueous phase with organic solvent 1.    USE - A straw liquefaction-separation method (claimed).    ADVANTAGE - The method is environment-friendly, simple, and low cost.    DETAILED DESCRIPTION - A straw liquefaction-separation method involves crushing straw e.g. food crop straw, oil crop straw, cotton straw, tobacco straw, hemp straw, and/or sugar crop straw, adding water, stirring and mixing to obtain straw pulp with solid:liquid ratio of 1:50-1:2, carrying out liquefaction reaction in high-pressure kettle at 140-350 degrees C and 0.1-20 MPa for 1-200 minutes, rapid cooling, performing solid-liquid separation on collected reaction mixture to obtain solid phase and aqueous phase, extracting solid phase and aqueous phase with organic solvent 1 e.g. tetrahydrofuran, dichloromethane, n-hexane, cyclohexane, acetone, and/or ethyl acetate, separating solid phase to obtain organic phase and solid residue which is used as soil improver, removing organic solvent in organic phase by vacuum distillation of a rotary evaporator to obtain bio-oil with organic solvent containing 1-5 times solid phase, separating aqueous phase using organic solvent 2 e.g. methylene chloride, ethyl acetate, and/or diethylether to obtain organic phase and residual aqueous phase, and removing organic solvent in organic phase by vacuum distillation to obtain bio-chemicals consisting of phenol, 2-methoxyphenol, 2,6-dimethoxyphenol, and 4-ethyl-2-methoxyphenol, washing remaining aqueous phase with recycled water using organic solvent which is 1-5 times the amount of aqueous phase.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram for preparation of straw extract for utilization. (Drawing includes non-English language text).