Abstract: Aiming at the measurement of alternating current（AC） parameters, it designs a high-performance electrical parameter acquisition device based on STM32. It uses voltage transformer and current transformer to collect the bus voltage and current, and compares the collected signals by operational amplifier. The ADC in STM32 and the external power metering chip are used to measure the electrical parameters. At the same time, the system supports the bus temperature detection function. The actual measurement shows that the equipment is easy to operate and the indexes meet the requirements.