The invention relates to a micro-grid modeling approach, in particular to a micro-grid versatile flow modeling method based on different types of energy. The approach comprises the steps of (1) constructing a versatile flow model, including energy and energy flow analysis, energy conversion link analysis, energy distribution link analysis, energy storage link analysis, energy utilization link analysis and energy management link analysis; and (2) constructing a versatile flow network model. The approach systematically describes the energy characteristics of energy flow in the processes of generation, conversion, transmission, storage and utilization through a unified quantitative versatile flow digital model. Meanwhile, the theory can also be used flexibly for energy unified quantitative analysis of a single device through lumped constraints. In practical applications, the invention can freely and flexibly select each links in the energy network as required, takes factors under different situations and constraints into full consideration, systematically establishes a corresponding versatile flow model, and achieves unified quantitative analysis of different types of energy in a micro-grid.