The invention provides an AC filter capacitor set unbalance current test apparatus, for realizing high-precision and high-efficiency automatic testing of AC filter unbalance currents. The apparatus comprises a central processor and a measurement unit connected with the central processor, wherein the measurement unit comprises a generation unit and an output unit connected therewith, the central processor comprises a host computer and a digital signal processor connected therewith through a network interface, the central processor is connected with a liquid crystal display bench and a data storage module, and the liquid crystal display bench comprises a man-machine interaction control interface. The apparatus has the advantages of simple structure, parameter adjustment and efficient and accurate measurement, can substantially improve the test precision and test efficiency of the AC filter unbalance currents, provides a strong reference for onsite equipment operation maintenance, can realize display, printing and information telemetering and is good in engineering actual application effect, thereby being worth wide promotion and application.