NOVELTY - Straw is processed into segments. The crushed straw raw material is fed into a furnace through a conveying device, and ignited at high temperature, and temperature is controlled to 180-200 degrees C to obtain a straw raw material. The wood tar is extracted from smoke formed by heating raw material at high temperature through a quenching multi-tube separation device. A mixture containing wood tar and wood vinegar liquid is extracted through a multilayer hole-staggered separation device. The wood vinegar liquid is extracted through an intorsion centrifugal separation device.    USE - Method used for carbonizing and separating straw.    ADVANTAGE - The method extracts wood tar, wood vinegar and combustible gas at same time by carbonizing straw.    DETAILED DESCRIPTION - Straw is processed into segments. The crushed straw raw material is fed into a furnace through a conveying device, ignited at high temperature, and temperature is controlled to 180-200 degrees C to obtain straw raw material. The wood tar is extracted from smoke formed by heating raw material at high temperature through a quenching multi-tube separation device. A mixture containing wood tar and wood vinegar liquid is extracted through a multilayer hole-staggered separation device. The wood vinegar liquid is extracted through an intorsion centrifugal separation device. The residual gas is purified in a purifying tower, and the temperature is controlled to 60-80 degrees C. INDEPENDENT CLAIMS are included for the following:    (1) quenching multi-tube separation device, which has a shell comprising a smoke inlet at lower portion and a smoke outlet at upper portion, a condensation port provided at the bottom of the shell, and tube separators and fine tubes provided in the middle of the shell;    (2) multilayer hole-staggered separation device, which has shell comprising smoke inlet at lower portion and smoke outlet at upper portion, condensation port provided at the bottom of the shell, and hole-staggered separator and separating plates with fine holes provided in the middle of the shell; and    (3) intorsion centrifugal separation device, which has shell comprising smoke inlet at lower portion and smoke outlet at upper portion, condensation port provided at the bottom of the shell, and a centrifugal separator with intorsion separating blades provided in the middle of the shell.