NOVELTY - A multi-section plasma cracking carbonaceous material reactor comprises 1st reaction tube (4) in which carbonaceous material (2), carrier gas, and 1st heated gas (1) are mixed and carbon material pyrolysis is performed and 2nd reaction tube (6) with N sections with N being greater than or equal to 2 in which greater than or equal to 1 carbonaceous material and carrier gas feed inlet is positioned on side of 1st reaction tube, greater than or equal to 1 1st heating gas inlet is positioned on top of 1st reaction tube, and greater than or equal to 1 2nd heat gas inlet is arranged on side of 2nd reaction tube. Heating gas is high-temperature plasma gas.    USE - A multi-section plasma cracking carbonaceous material reactor (claimed).    ADVANTAGE - Acetylene yield is maximized, pyrolysis reaction is fast, and reaction conversion rate is improved.    DETAILED DESCRIPTION - A multi-section plasma cracking carbonaceous material reactor comprises 1st reaction tube (4) in which carbonaceous material (2), carrier gas, and 1st heated gas (1) are mixed and carbon material pyrolysis is performed and 2nd reaction tube (6) with N sections with N being greater than or equal to 2 in which greater than or equal to 1 carbonaceous material and carrier gas feed inlet is positioned on side of 1st reaction tube, greater than or equal to 1 1st heating gas inlet is positioned on top of 1st reaction tube, and greater than or equal to 1 2nd heat gas inlet is arranged on side of 2nd reaction tube. Heating gas is high-temperature plasma gas. At least 1 chilling medium inlet (9) is used for chilling or freezing reaction products (11), and greater than or equal to 1 chilling product and gas outlet (10) is positioned on bottom or lower part of last reaction pipe section. An INDEPENDENT CLAIM is included for cracking method of cracking carbonaceous material which involves introducing carbonaceous material (2) through carbonaceous material gas and carrier gas feed inlet side of 1st reaction tube (4), introducing 1st heated gas (1) into 1st reaction tube which forces carbonaceous material and carrier gas to mix with 1st heated gas, pyrolyzing carbonaceous material under heating by 1st heated gas stream, introducing 2nd heated gas (5) into 2nd reaction tube (6) through 2nd heated gas inlet in which pyrolysis volatiles is produced in gas phase reaction and carbonaceous material in 2nd heated gas stream continues to be pyrolyzed to produce pyrolyzed or thermally decomposed products (11), and chilling or freezing pyrolyzed and/or thermally decomposed products using cooling medium.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional diagram of a plasma reactor section. (Drawing includes non-English language text).    1st heated gas (1)    Carbonaceous material (2)    1st reaction tube (4)    2nd heated gas (5)    2nd reaction tube (6)    Chilling medium inlet (9)    Gas outlet (10)    Cracking products (11)