NOVELTY - Preparing high magnification lithium iron phosphate/carbon complex cathode material comprises (i) mixing divalent iron source solution and aqueous solution of phosphorus source, controlling pH, stirring, filtering and washing to obtain lamellar iron phosphate, (ii) adding lamellar iron phosphate into a reaction kettle, supplementing phosphorus, adding an oxidizing agent, regulating pH, precipitating, filtering, washing and drying to obtain lamellar iron phosphate, and (iii) adding lamellar iron phosphate obtained in the step (ii), a lithium source and a carbon source, milling and sintering.    USE - The cathode is useful in electric car and large mobile devices.    ADVANTAGE - The method is economical and has reproducibility. The cathode has good electrochemical properties.    DETAILED DESCRIPTION - Preparing high magnification lithium iron phosphate/carbon complex cathode material comprises (i) mixing divalent iron source solution and aqueous solution of phosphorus source under a protective atmosphere and in presence of a dispersant in a stoichiometric ratio, controlling the pH of solution at 4-7, stirring the reaction for 0.5-3 hours, filtering and washing until the sulfate ion concentration in the sample is less than 500 ppm to obtain lamellar iron phosphate Fe3(PO4)28H2O, (ii) adding lamellar iron phosphate obtained in the step (i) into a reaction kettle, supplementing phosphorus according to the ratio of phosphorus: iron of 1:1-7:1, adding an oxidizing agent, regulating the pH to 2-3, precipitating iron phosphate completely, filtering, washing and drying to obtain the lamellar iron phosphate FePO4 2H2O, and (iii) adding the lamellar iron phosphate obtained in the step (ii), a lithium source and a carbon source in the molar ratio of iron: lithium of 1-1.05 and the carbon accounting for 5-30 wt.% of lithium iron phosphate, milling for 2-10 hours in water or ethanol of concentration 5-50% and sintering in protective atmosphere at the temperature 600-750 degrees C for 5-12 hours to obtain product.