NOVELTY - The device comprises an aromatization reactor group, a light aromatic hydrocarbon separator group and a heavy aromatic group separator serially connected with each other by a pipeline. The separator group is operated at normal pressure. The aromatization reactor group comprises an aromatic cooler, reaction product heat exchangers, a feeding heating furnace and an aromatization reactor and a cooling fluid outlet. The reaction product heat exchanger is connected with a cold fluid inlet by a pipeline. The cold fluid outlet is connected with another raw material reaction product heat exchanger.    USE - The device is useful for increasing quality of product by 4C isomerization process (claimed).    ADVANTAGE - The device reduces coal energy consumption, improves quality and color of the product to pure white, is stable and easy to control, and increases output value of the product.    DETAILED DESCRIPTION - The device comprises an aromatization reactor group, a light aromatic hydrocarbon separator group and a heavy aromatic group separator serially connected with each other by a pipeline. The separator group is operated at normal pressure. The aromatization reactor group comprises an aromatic cooler, reaction product heat exchangers, a feeding heating furnace and an aromatization reactor and a cooling fluid outlet. The reaction product heat exchanger is connected with a cold fluid inlet by a pipeline. The cold fluid outlet is connected with another raw material reaction product heat exchanger. The feeding heating furnace is connected with the cold fluid inlet by the pipeline. The cold fluid outlet of the former reaction product heat exchanger is connected with an inlet of a feeding heating reaction furnace by the pipeline. An outlet of the feeding heating furnace is connected with inlet of the aromatization reactor by the pipeline. An outlet of the aromatization reactor is connected with a hot liquid inlet of the feeding heating furnace by the pipeline. A fluid outlet of the lateral reaction product heat exchanger is connected with a feeding buffering tank through the pipeline. The light aromatic hydrocarbon separator group comprises a reaction product air cooler, a reaction product water cooler and a reaction product gas-liquid separate tin that are connected with each other by the pipeline. The reaction product gas-liquid separate tin and a gas compressor are connected with each other by the pipeline. A bottom part of the reaction product gas-liquid separate tin is connected with a stable tower feeding pump through the pipeline. The gas compressor, the stable tower feeding pump and a stable tower are connected with each other through pipeline. The stable tower is connected with a tower top air cooler by the pipeline. The stable tower top air cooler, a stable tower top water cooler, a stable tower top reflux tank and a stable tower top reflux pump are connected with each other by the pipeline. The stable tower top reflux pump and the stable tower are connected with each other by the pipeline. A bottom part of the stable tower is connected with a light aromatic hydrocarbon cooler by the pipeline. The light aromatic hydrocarbon cooler is connected with the heavy hydrocarbon tower by the pipeline. The heavy separator group comprises a tower top cooler, a tower top reflux tank and a heavy aromatics tower top reflux pump that are connected with each other by the pipeline. The tower top reflux pump and the heavy hydrocarbon tower are connected with each other through the pipeline. A bottom part of the heavy hydrocarbon tower is connected with the liquid inlet of the heavy aromatics cooler through the pipeline. The liquid outlet of heavy aromatic product cooler is connected with the heavy aromatics cooler pump through the pipeline.