NOVELTY - A porous lithium iron phosphate powder preparing method involves preparing raw material by weighing iron source, lithium source, phosphorus source and doped metal compound, adding carbon source precursor, and preparing colloid by adding iron source with water and heated mixture to obtain ferric oxide colloid. The obtained colloid is mixed with lithium source, phosphorus source, carbon source and doped metal compound followed by mixing resultant product, preparing precursor by drying the slurry to obtain lithium iron phosphate precursor and spray drying the precursor to form finished product.    USE - Method for preparing porous lithium iron phosphate powder.    DETAILED DESCRIPTION - A porous lithium iron phosphate powder preparing method involves preparing raw material according to the stoichiometric ratio of LixFeyPO4:Mz, where M is doped ion, x is 0.8-1.2, y is 0.8-1.2, z is 0.01-0.1 by weighing iron source, lithium source, phosphorus source and doped metal compound, adding 10-30 wt.% carbon source precursor, preparing colloid by adding iron source with de-ionized water to form iron salt solution, heated mixture to boil, adjusting pH value to 7-10 by adding alkali solution, reacting mixture to form ferrous hydroxide (Fe(OH)3), separating, washing with de-ionized water to make the concentration of the ferrous hydroxide to 10-100 g/l, heating mixture to boil, stirring at 200-600 rpm and reacting for 2-10 hours to obtain ferric oxide colloid. The obtained colloid is mixed with lithium source, phosphorus source, carbon source and doped metal compound, followed by mixing resultant product at 200-600 rpm to form uniformly dispersed colloidal mixed materials, preparing precursor by drying the slurry at an inlet temperature of 110-130 degrees C to obtain spherical lithium iron phosphate precursor having uniform grain size distribution, spray drying the obtained precursor in a crucible protection under inert atmosphere protection in a furnace at 300-500 degrees C for 2-10 hours in section-I and 500-800 degrees C for 2-12 hours in section-II to form carbon-coated spherical porous lithium iron phosphate powder.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating a method for preparing porous lithium iron phosphate powder.'(Drawing includes non-English language text)'