Li-S batteries are considered as a highly promising candidate for the next-generation energy storage system,attributing to their tremendous energy density.However,the two-dimensional island nucleation-growth process of lithium sulfide leads to a thick insulating film covering the electrode,inducing slow electrons transfer and mass-transfer of ions and liquid sulfur species in working Li-S cells.Here,we demonstrate a bio-inspired strategy of constructing ant-nest-like hierarchical porous ultrathin carbon nanosheet networks with the implants of metallic nanoparticles electrocatalysts (HPC-MEC) as efficient nanoreactors enabling rapid mass transfer,via a simple and green NaCl template.Such nanoreactors with a large active surface area could effectively anchor polysulfides for mitigating the shuttle effect,facilitating uniformly thin Li2S film,and promoting the mass transfer for fast sulfur species conversions.This helps contribute to a continuously high sulfur utilization in Li-S batteries with the HPC-MEC reactors.As a typical exhibition,cobalt embedded hierarchical porous carbon (HPC-Co) could realize to deliver a remarkably high specific capacity of 1,540.6 mAh·g-1,an excellent rate performance of 878.8 mAh·g-1 at 2 C,and high area capacity of 11.6 mAh·cm-2 at a high sulfur load of 10 mg·cm-2 and low electrolyte/sulfur ratio of 5 μL·mg-1.