NOVELTY - A precursor is prepared by dissolving nickel salt and weak base in solvent (s1), forming clear solution, pouring solution into water in polytetrafluoroethylene-lined autoclave, adding nickel mesh, and reacting. The product is washed, and dried to obtain nickel network-loaded precursor. Inorganic sulfur salt is dissolved in solvent (s2), stirred, poured into water in polytetrafluoroethylene-lined autoclave, nickel-loaded precursor is placed in a polytetrafluoroethylene-lined autoclave, reacted, washed and dried to obtain nano-nickel sulfide material having lamellar structure.    USE - Preparation of nano-nickel sulfide material used as electrode material in electric vehicle, portable electronic device and aerospace applications.    ADVANTAGE - The method enables simple, economical, easy and environmentally-friendly preparation of lamellar-structured nano-nickel sulfide material having small particle size, uniform distribution, and excellent rate performance, electrochemical performance and electroconductivity, without addition of polymeric binder and conductive agent.    DETAILED DESCRIPTION - A precursor is prepared by providing nickel salts and weak base as raw materials, dissolving in solvent (s1), stirring, forming clear solution, pouring clear solution into water in polytetrafluoroethylene-lined autoclave, adding nickel mesh, and reacting at certain temperature for 20 hours in an incubator. The obtained product is washed with deionized water and ethanol, and dried in vacuum oven to obtain nickel network-loaded precursor. Inorganic sulfur salt is provided, dissolved in solvent (s2), and stirred, to form clear solution. The clear solution is poured into water in polytetrafluoroethylene-lined autoclave, nickel-loaded precursor is placed in a polytetrafluoroethylene-lined autoclave, and reacted at certain temperature in an incubator. The resultant product is washed with deionized water and ethanol, and dried in vacuum oven, to obtain nano-nickel sulfide material having lamellar structure. The concentration of nickel salt is 1x 10-3 mol/L to 1 mol/L. The concentration of weak base is 1x 10-2 mol/L to 1 mol/L. The concentration of inorganic sulfur salt is 1x 10-1 mol/L. Nickel having three-dimensional network porous structure is provided as carrier in preparation of nano-nickel sulfide material.