Single atom catalysts (SACs) have emerged as an attractive concept for promoting heterogeneous reactions due to the unique properties, such as high activity and nearly 100% atom utilization. However, the synthesis of SACs remains a challenge due to the sintering of metal atoms at high temperature. In this study, Fe single atom on N doped porous carbon (Fe SA-NC) catalyst was obtained by ultrastrong polarity of molten salt (MS). Fe SA-NC shows honeycomb-like porous morphology and possesses a high specific surface area of 2072 m²·g^-1. The content of Fe element in Fe SA-NC is 0.57wt%. The isolated Fe atoms are observed by AC HAADF-STEM, and the X-ray absorption fine structure (XAFS) analysis confirms that Fe atoms disperse in the form of Fe-N₄ on the carbon substrate. Fe SA-NC shows 0.85 V half-wave potential and 5.79 mA·cm^-2maximum current density for ORR in 0.1 mol/L KOH solution. Fe SA-NC displays high selectivity for ORR four electron pathway (H₂O₂ yield<2%, electron transfer number is 3.9), outstanding stability, and good methanol tolerance.