Abstract: Aiming at the present coal mine using the monitoring power quality status of the equipment simplification,only can monitor one or several of these performance indicators,development and designed a complete power quality analysis system,including the detailed design of hardware and software.The hardware design of the signal are conditioning circuit for the problem of low measurement accuracy caused by signal interference in data acquisition,Software design is the core of the power quality analysis of the development of key design and development of the voltage fluctuation and flicker,voltage sag and harmonic analysis calculation module software program to achieve power quality monitoring of coal power supply system analysis.Finally,the signals are generated by the LabVIEW signal generator as the system input signal source to experiment with the system,through the monitoring results and theoretical analysis of comparative analysis shows that the accuracy of the analysis system to meet the requirements.