The invention provides a porous graphene material, a preparation method thereof, a capacitor electrode, a capacitor and an electric device, and relates to the technical field of graphene. The preparation method of the porous graphene material uses potassium carbonate as an activator and a template, uses coal tar as a carbon source, mixes coal tar and potassium carbonate, and prepares a porous graphene material by calcining. The preparation method is environmentally friendly. , Simple, high yield, low equipment requirements, etc., the prepared porous graphene material has the characteristics of controllable specific surface area, well-developed pores, and thin sheets. The porous graphene material provided by the present invention is prepared by the above-mentioned preparation method. The structural characteristics of the porous graphene material make it possible to shorten the ion diffusion distance, facilitate the transmission of charges, and expose more adsorption sites. point, which is conducive to the further application of porous graphene materials. The present invention also provides a capacitor electrode, which is made of the above-mentioned porous graphene material.