NOVELTY - A nonequilibrium plasma device comprises a reactor which is a sealed tube shaped cavity, and high voltage electric source (1) for supplying electricity to reactor. The reactor has a column central electrode (4) and a telescopic convergent-divergent nozzle external electrode (6). The central electrode is fixed in the cavity through an insulating bush (7) and a sealed connecting sleeve (8). A tangential gas guide tube (3) is provided on the tube shaped cavity. An exhaust flow (2) containing evaporable organic matter passes into the cavity from the gas guide tube along a tangential direction.    USE - A nonequilibrium plasma device for removing volatile organic compounds and producing hydrogen.    ADVANTAGE - Generation of nitrogen oxide can be avoided.    DETAILED DESCRIPTION - A nonequilibrium plasma device comprises a reactor which is a sealed tube shaped cavity, and high voltage electric source (1) for supplying electricity to plasma reactor. The reactor has an outer cover (10), a column central electrode (4) provided at a tube shaped cavity central line, and telescopic convergent-divergent nozzle external electrode (6) provided outside of the central electrode. The distance between two electrodes is 0.5-5 mm. The central electrode is fixed in the tube shaped cavity through an insulating bush (7) of the central electrode and a sealed connecting sleeve (8). The external electrode is fixed in the tube shaped cavity through an insulating bush (9). A tangential gas guide tube (3) is provided on the tube shaped cavity. An exhaust flow (2) containing evaporable organic matter passes into the tube shaped cavity from the tangential gas guide tube along a tangential direction.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of the nonequilibrium plasma device.    Electric source (1)    Exhaust flow (2)    Gas guide tube (3)    Central electrode (4)    External electrode (6)    Insulating bushes (7, 9)    Sealed connecting sleeve (8)    Outer cover (10)