The invention relates to a method for preparing a nano LiFePO4/C electrode material. The preparing method comprises the following steps: first, synthesizing a compound of iron phosphate and poly furfuryl alcohol by using an in-situ polymerization limit method, then grounding the compound with a lithium salt, uniformly mixing, and finally preparing the LiFePO4/C composite material by high temperature sintering in an inert atmosphere or reducing atmosphere. According to the method disclosed by the invention, the particle size of the electrode material can be effectively reduced, and the transmission efficiency of electrons can be remarkably improved due to the coated carbon layer. The composite material has high specific capacity, excellent rate performance and cycling performance, and is suitable for the high rate charging/discharging requirements.