NOVELTY - An iron source compound, a lithium source compound and a phosphorus source compound are added to the polymer solution, reacted and stirred to obtain electrostatic spinning solution. The obtained spinning solution is injected to a syringe, spinning voltage is set to 5-30 KV, and the solution feeding speed is controlled to 0.01-10 mL/hour, to obtain lithium-iron phosphate precursor. The lithium-iron phosphate precursor is dried at 50-80 degrees C under inert atmosphere, calcined at 550-850 degrees C for 1-24 hours and cooled to room temperature, to obtain nano-structured lithium-iron phosphate.    USE - Synthesis of nano-structured lithium-iron phosphate used for battery.    ADVANTAGE - The nano-structured lithium-iron phosphate improves the charging and discharging performance, and capacity of the battery.    DETAILED DESCRIPTION - An iron source compound, a lithium source compound and a phosphorus source compound are added to the polymer solution with a concentration of 4-50%, reacted at 25-100 degrees C for 1-24 hours and stirred to obtain electrostatic spinning solution. The molar ratio of lithium ion (Li+), ferrous ion (Fe2+) and phosphate ion (PO43-) is 0.9-1.1:1:1. The ratio of total mass of iron source, lithium source and phosphorus source compounds (m1) and the mass of polymer solution (m2) is 0.0025-10. The obtained spinning solution is injected to a syringe, spinning voltage is set to 5-30 KV, and the solution feeding speed is controlled to 0.01-10 mL/hour, to obtain lithium-iron phosphate precursor. The lithium-iron phosphate precursor is dried at 50-80 degrees C under inert atmosphere, calcined at 550-850 degrees C for 1-24 hours and cooled to room temperature, to obtain nano-structured lithium-iron phosphate. The iron source compound is ferrous oxalate, ferric oxide and/or ferric phosphate. The lithium source compound is lithium dihydrogen phosphate, lithium carbonate, dilithium hydrogen phosphate and/or lithium hydroxide. The phosphorus source compound is lithium dihydrogen phosphate, diammonium phosphate, ammonium dihydrogen phosphate and/or phosphoric acid. The polymer is polyvinyl alcohol, polyacrylonitrile and/or polyvinyl pyrrolidone. The solvent of polymer solution is water, ethanol, ethylene glycol, acetic acid and/or isopropyl alcohol.