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The online power quality automatic calibration system is designed for the problems that the power quality analyzer encounters many calibration items and calibration points in the traditional calibration process, takes a long time, the operator needs to operate the whole process, and the error caused by the manual recording of data. This system uses LabVIEW 2012 as the software development platform and Fluke 6100B as the standard signal source. The computer and the standard signal source are connected through NI USB to GPIB. The program is designed uses virtual instrument software architecture(VISA) functions and standard command for programmable instruments(SCPI) standard order and fully functional state machine architecture to automatically control the output of the standard source. Complete the signal acquisition and display of the calibrated equipment of various manufacturers and models of power quality analyzers, and generate reports with one click. The program adopts a modular design, which reduces the coupling between different functional codes. When equipment or user requirements change, software updates and upgrades can be easily completed. The power quality online calibration system greatly reduces errors caused by manual operation, improves calibration accuracy and efficiency, and saves personnel and time costs.