The smart microgrid cluster is an integral part of the smart grid， its control and management being urgent problems to be solved. The technical advantages of agent-based service-oriented architecture（ASOA） are analyzed， based on which a design scheme of information management platform for smart microgrids is proposed. In the scheme， the agent is packaged into a smart service principal， the smart service principals communicate with each other by Web service technology. The smart service is described at length using the organizational model and interaction model of the smart service principal. The feasibility of the scheme designed is shown by the test system simulation and the real-time character， security and reliability of the platform are analyzed.