An apparatus for producing aromatic hydrocarbons, the apparatus comprising: a C6 separation column configured to being supplied with a raw material stream, supplying an upper discharge stream to a first gasoline hydrogenation unit, and supplying a lower discharge stream to a C7 separation column; the C7 separation column configured to being supplied with the lower discharge stream from the C6 separation column, supplying an upper discharge stream to the first gasoline hydrogenation unit or a hydrodealkylation reaction unit, and supplying a lower discharge stream to a C8 separation column; the first gasoline hydrogenation unit configured to being supplied with the upper discharge stream from the C6 separation column or the upper discharge stream from the C6 separation column and the upper discharge stream from the C7 separation column to perform a hydrodesulfurization reaction; the C8 separation column configured to being supplied with the lower discharge stream from the C7 separation column, removing a lower discharge stream, and supplying an upper discharge stream to a second extractive distillation column; the second extractive distillation column configured to being supplied with the upper discharge stream from the C8 separation column and supplying an upper discharge stream to a second gasoline hydrogenation unit or the hydrodealkylation reaction unit; the hydrodealkylation reaction unit configured to being supplied with the upper discharge stream from the C7 separation column or the upper discharge stream from the C7 separation column and the upper discharge stream from the second extractive distillation column to perform a dealkylation reaction; and the second gasoline hydrogenation unit configured to being supplied with the upper discharge stream from the second extractive distillation column to perform a hydrodesulfurization reaction. a C6 separation column configured to being supplied with a raw material stream, supplying an upper discharge stream to a first gasoline hydrogenation unit, and supplying a lower discharge stream to a C7 separation column; the C7 separation column configured to being supplied with the lower discharge stream from the C6 separation column, supplying an upper discharge stream to the first gasoline hydrogenation unit or a hydrodealkylation reaction unit, and supplying a lower discharge stream to a C8 separation column; the first gasoline hydrogenation unit configured to being supplied with the upper discharge stream from the C6 separation column or the upper discharge stream from the C6 separation column and the upper discharge stream from the C7 separation column to perform a hydrodesulfurization reaction; the C8 separation column configured to being supplied with the lower discharge stream from the C7 separation column, removing a lower discharge stream, and supplying an upper discharge stream to a second extractive distillation column; the second extractive distillation column configured to being supplied with the upper discharge stream from the C8 separation column and supplying an upper discharge stream to a second gasoline hydrogenation unit or the hydrodealkylation reaction unit; the hydrodealkylation reaction unit configured to being supplied with the upper discharge stream from the C7 separation column or the upper discharge stream from the C7 separation column and the upper discharge stream from the second extractive distillation column to perform a dealkylation reaction; and the second gasoline hydrogenation unit configured to being supplied with the upper discharge stream from the second extractive distillation column to perform a hydrodesulfurization reaction.