With the rapid development of data center, the energy consumption problem of data center is becoming more and more prominent. The energy management and power supply and distribution design of data center have become ahot issue. Efficient and reliable power distribution system scheme of data center is an effective way to improve the power consumption efficiency of data center and reduce the energy consumption of equipment. In order to realize energy saving in data center, it is necessary to monitor each electrical load first. However, there are many load circuits in data center. Traditional measuring instruments cannot meet the requirements of cost, volume, installation, construction and other aspects. In this case, the multi-circuit monitoring device which is suitable for centralized monitoring in data center is necessary to be used.