Defect engineering is capable of significantly enhancing catalytic performance of target materials, but very few high efficiency of defect-engineered catalysts were reported involving a facile and targeted-production synthetic technique. Here, a unique localized micro-deflagration strategy combined with postprocessing of heat treatment was reported to synthesis efficient oxygen reduction reaction (ORR) nanocarbon shells electrocatalyst. This micro-deflagration endows ultrafast and large scale production of highly porous nanocarbon equipped with rich nitrogen (11.86 at%) and parts of N-atoms can be further removed via post heat treatment for constituting targeted active sites of defects for ORR. Loaded with large specific surface area (540 m2g-1) and 6.05 at% N-doping, the defective nanocarbon shells allows excellent electrocatalytic activity (Eonset of 0.89 V vs.RHE, E1/2 of 0.79 V vs.RHE and Jk of 6.17 mA cm-2), long-term stability, and tolerance to crossover effect, comparable to commercial Pt/C in alkaline electrolyte. Most importantly, this work has achieved the creative synthesis of metal-free defect-rich carbon materials and significantly enriched the research of defect engineering chemical electrocatalyst.