The invention provides a determining method for equalizing current value matched with a power battery system. The determining method comprises determination of a minimum value of the equalizing current value and determination of a maximum value of the equalizing current value, wherein the minimum value of the equalizing current value is determined according to the self-discharge capacity of the battery; the maximum value of the equalizing current value is based on the criterion that the influence on sampling accuracy of a sampling module is within an allowed range. The determining method for the equalizing current value obtains the equalizing current value satisfying the characteristic of the power battery system through the reasonable calculation method on the collected data; the minimum value and the maximum value of the equalizing current value are accurately determined; data and theory support for the power battery system in controlling the equalizing current are provided; and the demand of rapidly improving the consistency of the battery pack through the equalizing function is met, and meanwhile, the battery system can be well maintained, so that the validity and long lasting of the equalizing function are fully ensured.