The utility model discloses a merging cells sampling and test system, system include that merging cells includes CPU module, IO module, intrinsic AC module and can dismantle the standard AC module of transplanting, the CPU module is connected to the sampling output end of intrinsic AC module and standard AC module, the CPU module passes through IO module control three -phase AC analog signal source follower analog signal source, the output difference connection standard AC module and the intrinsic AC module in three -phase AC analog signal source, the host computer includes man -machine interface, and the last merging cells mode that can supply user action that is equipped with of man -machine interface selects the button, the host computer is followed man -machine interface and is acquireed the merging cells mode data of subscriber selection, and then sends control command to merging cells's CPU module, the CPU module is according to the work of received control command control IO module, intrinsic AC module and standard AC module. Utilize the utility model discloses can realize multiple functions such as merging cells sampling, precision calibration and transient state test, the cost is reduced when efficiency improves.