The invention relates to a high-capacity iron phosphate lithium power battery, which is characterized in that the anode material uses the iron phosphate lithium; an anode current collector uses the aluminum foil; a conductive agent uses the superconducting carbon black and the conductive graphite; the anode material binder uses the polyvinylidene fluorine; the cathode material uses the natural graphite or the artificial graphite; the cathode current collector uses copper foil; the conductive agent uses the superconducting carbon black and the conductive graphite; and the cathode material binder uses the polyvinylidene fluorine or the sodium carboxymethylcellulose and the styrene butadiene rubber. The invention also discloses a processing technology of the high capacity iron phosphate lithium power battery, comprising the following step: matching ingredients, coating, baking, rolling, processing slice, baking, staking, assembling upper cover , baking, liquid injection, formation and partial volume. The invention adopts a stacking type, and has simple processing technology, compact battery structure and stable performance; thus, the battery capacity is greatly improved. The invention has an advantage of providing the lithium ion secondary battery of a driving energy source to the small and medium sized electric tools, such as the household electric appliance, the electric bicycle, the electric motorcycle and the electric automobile.