The mass production of porous graphene (PG) with short ion transport distance and abundant accessible pores has attracted considerable attention,which can be used as the most promising electrode materials for high-energy-density supercapacitors.However, the high-efficiency and low-cost synthesis of the mentioned PG remains a big challenge.In this paper, a template strategy coupled with in-situ chemical activation was designed to synthesize PG from polycydic aromatic hydrocarbons such as coal tar pitch and petroleum pitch.First, 3D stacked nano-MgO and KOH particles were coated with the liquefied pitch, which was then polymerized into 3D interconnected films over these partides.Then, the 3D film can be converted into graphene sheets via annealing.After that, the PG materials can be obtained by removing the templates via acid washing.The as-made structures feature with interconnected capsules or sheets constructed by graphene with high surface area and well-balanced mesopore and micropore.When evaluated as electrodes for supercapacitors, PG exhibits high capacitance, good rate performance and excellent cycle stability.A symmetric supercapacitor fabricated from these PG materials shows very high energy density.This work opens up an efficient way for low-cost and mass production of PG materials from polycyclic aromatic hydrocarbon sources for high performance supercapacitors.