In view of the problem that power supply enterprises have a large number of power supply tasks and occupy a large amount of manpower and material costs in China, an operation model of power-guaranteed microgrid based on multi-party game among photovoltaic investors, energy storage investors and microgrid operators is proposed, considering the technical economy of distributed photovoltaic, user-side energy storage and microgrid in the field of power supply protection. Firstly, for the current emergency power supply vehicles or power generation vehicles, there are problems such as low asset utilization, environmental protection, and noise pollution, the idea of power supply protection for photovoltaic-storage microgrid instead of emergency power supply vehicles or power generation vehicles is discussed in detail. Then, based on the benefits and subsidies of microgrid participating in power supply protection, considering the distribution of photovoltaic power generation and its selling price among the photovoltaic -storage-microgrid, the investment cost and benefit composition of the three investment entities are analyzed, and the cooperative game method is used to optimize and discuss the interest equilibrium points of the three investment entities, so that the benefits of the three entities can be optimized at the same time. Finally, the economic benefits of photovoltaic investors, energy storage investors, and microgrid operators of the operation model proposed in this paper are analyzed through examples.