A method for synthetically utilizing electrode material of lithium iron phosphate battery includes such steps as leaching electrode material of lithium iron phosphate battery with hydrochloric acid, solid-liquid separation to obtain lithium-containing leaching solution and first filter residue; Removing impurities from lithium-containing leaching solution, precipitating, and washing to obtain lithium carbonate; The first filter residue is leached with hydrochloric acid, and after solid-liquid separation, an immersion liquid containing Fe and PO4<3-> and a second filter residue are obtained; Feis extracted by adding additive into the leaching liquor containing Fe and PO4<3->. Stripping the loaded organic phase water to recover iron; Evaporating the raffinate, recovering the volatile phaseto obtain hydrochloric acid, and concentrating the concentrated solution to obtain phosphoric acid; The second filter residue is washed to obtain a carbonaceous substance. The method realizes the comprehensive recovery of lithium, iron, phosphorus and carbon in the lithium iron phosphate electrode material; and the method realizes the comprehensive recovery of lithium, iron, phosphorus and carbonin the lithium iron phosphate electrode material. Without high temperature treatment, the energy consumption is low and the process is simple. The acid medium is recycled, which reduces the waste discharge and avoids the environmental pollution in the production process.