A lithium ion power battery self-discharge consistency evaluation method comprises the following steps: 1, selecting a plurality of batteries with good capacitance and internal resistance consistencyfrom lithium iron phosphate batteries of the same production batch, the same specification model and the same material system; using a constant current constant voltage charging system and a constantcurrent discharge system to charge and discharge the batteries for many times in cycle under the room temperature; 2, adjusting the batteries to an empty charge state under the room temperature; 3, screening batteries with the self discharging rate bigger than 3%; 4, adjusting the battery SOC to 10%SOC to 30% SOC charge state; 5, measuring the open-circuit voltage after battery high temperature laying, and calculating the battery voltage drop [delta]V or voltage drop K in a unit time; 6, calculating the average value X of all battery [delta]V or K values and the standard deviation [sigma], andselecting the batteries in the confidence interval of [X-2[sigma], X+2[sigma]]. The method can improve the battery self discharging rate, can shorten the laid-up period, and can reduce the productioncost.