Abstract: Three-dimensional (3D) graphene networks have aroused great interest because they effectively solve the agglomeration problem of graphene powder and improve its utilization efficiency. Such a material also has the advantages of a porous structure, lightweight, high thermal conductivity and superior electrical conductivity, and is widely used in thermal management and electromagnetic interference shielding. To fully understand 3D graphene networks, we summarize the different preparation strategies and properties of isotropic and anisotropic 3D graphene networks. The latest research progress of thermal interface materials, phase change materials, electromagnetic interference shielding materials and microwave absorbing materials is reviewed. Finally, the development and outlook for 3D graphene networks are proposed. This review provides new perspectives and research directions for the future development of 3D graphene networks in heat dissipation and electromagnetic interference shielding for 5G electronic devices.