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With the development of new energy technologies, large-capacity power Li-ion battery is demanded more and more, especially it has been widely used in the field of electric vehicles. It designs a large-capacity Li-ion battery formation system, and illustrates its composition and working principle. It uses a programmable feedback voltage limiting constant current chopper control circuit with having voltage limiting protection function to prevent Li-ion battery over-charge and over-discharge so as to improve current control accuracy of the charge-discharge process; formation system uses upper and lower computer structure with consisting of a stage crew (server) and a number of audience-bit machine (into units) which compose an industrial 485 bus network to use the host computer in the formation process for real-time monitoring and data recording. By testing, the system has some characteristics, such as large charge and discharge current, high control accuracy, multiple-step programming, etc., and it can meet the requirements of the large-scale power Li-ion battery formation production.