System and method for preparing graphene by means of SiC thermal cracking

The invention relates to a system and a method for preparing graphene by means of SiC thermal cracking. The system comprises a gas-refining quartz tube serving as a vacuum cavity, an SiC substrate, an induction heating graphite boat and a carbon felt heat preservation layer, wherein the SiC substrate is arranged in the middle of the vacuum cavity and in a graphite boat sample groove. The graphite boat is arranged in the middle of the carbon felt heat preservation layer. The carbon felt heat preservation layer is closely attached to the wall of the vacuum cavity to form a hollow structure. One end of the vacuum cavity is provided with a vacuum cavity door used for opening and closing the vacuum cavity. A vacuumizing gas circuit formed by sequentially connecting a baffle valve, a molecular pump and a mechanical pump is arranged below the vacuum cavity door and used for vacuumizing the vacuum cavity according to needs. The other end of the vacuum cavity is provided with an infrared detection window made of glass permeable by infrared rays. The system and the method for preparing graphene by means of SiC thermal cracking have the advantages that high-quality graphene can be prepared at the high barometric-pressure state (0.1-1 barometric pressure).