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The invention discloses battery-grade ferric phosphate and its preparation method. The battery-grade ferric phosphate is anhydrous ferric phosphate FePO4. The powder is composed of monodisperse olive-shaped particles with regular shapes. Bulk density is high, and tap density reaches up to 1.5-1.6 g/cm<3>. The preparation method comprises the following steps: using trivalent ferric salt ferric nitrate as an iron source, and using phosphoric acid or ammonium biphosphate or diammonium phosphate or ammonium phosphate as a phosphorus source; adding an ammonia-water solution as a pH value conditioning agent into a mixed aqueous solution of the iron source and the phosphorus source, stirring and reacting and ageing to generate high-density olive-shaped crystalline compound NH4Fe2(OH)(PO4)2.2H2O containing ammonium, hydroxide and crystal water; and carrying out solid-liquid separation, roasting and decomposing to prepare the battery-grade ferric phosphate. The battery-grade ferric phosphate is an ideal raw material for preparing the lithium ion batteries cathode material lithium iron phosphate. The preparation method is suitable for mass, economic, stable and reliable production of the high-quality high-density battery-grade ferric phosphate, has no discharge of waste water, has obvious advantages, and has practical value.