The invention provides a high-capacity electrode material for a high-nitrogen-doped carbon-coated metal sulfide sodium secondary battery and application thereof. A soluble metal salt solution reacts with an organic ligand to obtain a micron-sized metal organic framework precursor; the carbonization temperature of the precursor is then controlled in an inert atmosphere to obtain a carbon-coated metal intermediate; and the prepared intermediate is then fully grinded and mixed with thiourea or L-cysteine in a certain proportion, reaction in the inert atmosphere at a proper temperature is carriedout, and an electrode material for a high-nitrogen-doped carbon-coated metal sulfide sodium secondary battery can be obtained. The nitrogen doping content in the interface carbon layer can be effectively controlled by adjusting and controlling the carbonization temperature of the precursor. The content of doped nitrogen in the coated carbon layer is effectively regulated and controlled, the reversibility of a metal sulfide conversion reaction is improved through high-content nitrogen doping, and the prepared high-nitrogen-doped carbon-coated metal sulfide shows high specific capacity, excellent rate capability and cycling stability as an electrode material of a sodium secondary battery.