With the development of energy storage devices, electrode with high specific surface area has attracted significant attention. Meanwhile, miniaturization of energy storage system requires not only high gravimetric but also high volumetric specific surface area. Three-dimensional graphene (3DG) and its application in electrodes has been widely researched. Fabricating reduced graphene oxide (rGO) sheets into a foam structure is a simple and low-cost method to prepare 3DG. However, the inter-sheet resistance between rGO sheets hinders electron transfer, and large amounts of defects in rGO reduces the electron conductivity. An effective way to avoid such drawbacks is to synthesize interconnected 3DG by chemical vapor deposition (CVD) of graphene on metal templates. Interconnected 3DG synthesized by CVD features high conductivity and stability. Traditionally, the metal templates used in CVD methods are metal foams with large pore size of hundreds of micrometers. Due to the hollow structure with large interior pores, it usually has quite low volumetric specific area and poor mechanical robustness. Herein we reports a methods of preparing freestanding mesoporous 3DG by using metal powder sinter as template. Copper powder with average particle size of ~50 nm is sintered into mesoporous copper bulk, meanwhile methane and hydrogen are introduced to carry out the CVD process. The Cu template is then etched by Fe2(SO4)3 to obtain freestanding mesoporous 3DG bulk. By changing the parameters of the process, the morphology and structure of 3DG can be precisely controlled. The as-prepared 3DG bulk is with average pore size of ~7 nm, and the surface area of the sample is around 450 m2/g. Furthermore, it features high mechanical resiliency after pressed to high strain of 50%. As the pore size is minimized, the necessary thickness of graphene layer to achieve mechanical robustness can also be remarkably reduced, leading to high gravimetric and volumetric specific area. Such pore size distribution not only increases surface area and improves mechanical properties, but also provides unblocked diffusion path for electrolyte ions. Thus, it is favorable for energy storage devices.