The invention discloses a method for the normal-pressure phosphoric-acid leaching of nickel-cobalt and the synchronous preparation of iron phosphate. The method comprises the following steps: subjecting laterite nickel ore to normal-pressure acid leading treatment, and then carrying out solid-liquid separation to obtain a leaching residue of iron phosphate and a leaching solution of enriched nickel-cobalt, wherein in the leaching process, phosphoric acid with a concentration of 1-3 mol/L is adopted; the adding amount of phosphoric acid is 1-3 times as much as the theoretical molar mass of metal elements in the leached transformed laterite nickel ore; and the laterite nickel ore is subjected to transformation at 300-400 DEG in advance before the acid leading treatment. The method is particularly suitable for the treatment of low-grade limonite-type laterite nickel ore; the nickel-cobalt recovery rate is high; the nickel-iron separation effect is good; and the leaching residue of iron phosphate is not only applicable to the preparation of iron phosphate lithium batteries but also utilized as a raw material for the manufacturing of catalysts and ceramics.