According to the research status of intelligent technology and unattended technology of artillery in China, the energy management and construction plan of unattended artillery are put forward. Firstly, energy storage by variable energy device can realize rational utilization and distribution of energy. Secondly, using neural network, intelligent learning and other technologies, the knowledge system based on task-oriented model rules is realized. Thirdly, through fault isolation, diagnosis and reconstruction, the autonomous fault management of energy system is realized. Finally, the results show that the research can meet the requirements of intelligent, unmanned and information management of ground weapon energy, and has important significance for the research and engineering application of future artillery unattended energy subsystem.