At present，microgrids suffer from low energy management efficiency and poor operation stability due to outputfluctuation of distributed generation，difficult coordination of multiple devices，and insufficient real-time performance ofcontrol. A hierarchical control strategy for microgrid energy management system is designed based on PLC technology，and an overall design framework of hierarchical control for microgrid energy management system is constructed. Taking Siemens S7-1500 as the core，four functional modules are designed respectively，namely microgrid data acquisition，PLC communication network，energy control decision-making，and monitoring and alarm. A three-layer control architecture of scheduling， coordination and execution is constructed in the core control decision-making module to realize intelligent control of microgridenergy management. The results show that the bus voltage deviation rate of the microgrid is ≤0.28%，the control response time is ≤94.58 ms，and the State of Charge(SOC)of energy storage is stabilized at 20% to 80%. The strategy improves the operation stability and economy of microgrids and provides support for engineering applications.