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A nitrogen‐doped MnO nanoparticles/ porous carbon nanosheets (N−MnO/PCS) composite was synthesized by the room‐temperature redox reaction between KMnO4 and PCS followed by a facile carbothermal reduction, and a subsequent coating process of urea onto MnO/PCS and heat treatment. N−MnO nanoparticles with a grain size of about 30 nm are homogenously embedded on the surface of the N−PCS, corresponding to a high loading of 50.09 wt.% in the resulting composite. Benefiting from the enhanced reaction kinetics as well as electrical conductivity and continuous transport pathways of Li+/electron resulting from the N‐doping and hybridization of the cross‐linked porous carbon substrate, the as‐synthesized N−MnO/PCS‐1 electrode delivers a large reversible specific capacity (1497.2 mA h g−1 at 100 mA g−1 after 160 cycles), outstanding rate capacities (710.6 mA h g−1 at 1 A g−1 and 640.1 mA h g−1 at 2 A g−1) and long‐term cycling stability with specific capacity (976 mA h g−1 at 0.5 A g−1 after cycling 300 cycles). The simple and green synthesis and electronic properties of this composite mean that it has great potential as a high‐capacity anode material for practical application in large‐scale energy storage devices. [ABSTRACT FROM AUTHOR]