The invention relates to the technical field of graphene and particularly relates to a graphene preparation device and a method for preparing graphene and performing annealing restoration on graphene, wherein continuous preparation and restoration of graphene can be realized when the reaction temperature of a reaction device is kept unchanged or changes a little, thus the production efficiency is improved, the energy consumption is reduced, and conditions are created for industrial production. The invention provides the graphene preparation device which comprises a reaction device, a holding device and a discharge device, wherein the holding device comprises a feed hole for introducing the powder for reaction, an air blowing inlet for introducing inert gas, and a discharge hole; the discharge hole is communicated with the feed hole of the reaction device; and the discharge device is communicated with the discharge hole of the reaction device. The embodiment of the invention is applied to the preparation and restoration of graphene powder.