▎ 摘　　要

NOVELTY - The device comprises a reaction chamber (3), which is provided with a first gas inlet (7), a second gas inlet and a material feeding port that are arranged on walls of the reaction chamber except a pneumatic bottom wall (4). A sample collecting chamber (5) is arranged below the reaction chamber. The pneumatic bottom wall is divided into two blocks that are respectively connected to a side wall of the reaction chamber through two rotary shafts. A lower face of the reaction chamber is provided with a pneumatic pressure sensor or hydraulic pressure sensor. USE - The device is useful for preparing graphene. DETAILED DESCRIPTION - The device comprises a reaction chamber (3), which is provided with a first gas inlet (7), a second gas inlet and a material feeding port that are arranged on walls of the reaction chamber except a pneumatic bottom wall (4). A sample collecting chamber (5) is arranged below the reaction chamber. The pneumatic bottom wall is divided into two blocks that are respectively connected to a side wall of the reaction chamber through two rotary shafts. A lower face of the reaction chamber is provided with a pneumatic pressure sensor or hydraulic pressure sensor. A sole exhaust port is arranged on an upper part of the reaction chamber or the first gas inlet. The exhaust port is connected with a waste gas recovery device such as a carbon capture device. The material feeding port is connected with an automatic feeing system. The sample collecting chamber is successively connected with a sample channel and a final sampling chamber (6). An INDEPENDENT CLAIM is included for a method of preparing graphene. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a device for preparing graphene. Reaction chamber (3) Pneumatic bottom wall (4) Sample collecting chamber (5) Final sampling chamber (6) Gas inlet. (7)