Preparation method and growth device of graphene powder

The invention relates to the technical field of carbon materials, in particular to a preparation method and a growth device of graphene powder, and the method comprises the following steps: introducing a carbon source gas into molten first liquid metal placed in an inert atmosphere environment to form carbon-containing bubbles in the liquid metal, and enabling the carbon-containing bubbles to generate graphene under the action of the first liquid metal, the generated graphene is carried to the liquid level of the first liquid metal through carbon-containing bubbles; collecting the graphene and the tail gas rising to the liquid level of the first liquid metal by utilizing airflow, and introducing the collected graphene and tail gas into molten second liquid metal in an inert atmosphere environment so as to purify the graphene in the bubbles through the second liquid metal until the bubbles carrying the graphene rise to the liquid level of the second liquid metal; and the graphene rising to the liquid level of