The invention relates to a digitization power quality monitoring device. The device comprises a power supply module, a data collecting module, an operational amplifier, an Analog to Digital (A / D) shifting chip, a control chip and a monitor, wherein the output end of the data collecting module is connected to the operational amplifier, the operational amplifier is connected to the control chip through the A / D shifting chip, the control chip is connected to the monitor, the data collecting module collects external current and pressure data, the data are transmitted to the A / D shifting chip through the modulation of the operational amplifier, the A / D shifting chip transmits the data to digital signals and transmitted the digital signals to the control chip, the control chip calculates received data, power quality data are obtained, and when the monitor is required to display, the control chip transmits corresponding power quality data to the monitor for displaying. Compared with the prior art, the device has the advantages of being high in data monitoring accuracy, good in adapting ability, high in function, low in power consumption and convenient to install.