The invention belongs to the technical field of new energy and especially relates to a multi-zone mutually-supported independently-operating micro power grid system, and specifically to a micro power grid system permanently separated from a large power grid to independently operate and stabilized by mutual support and maintenance of multiple zones. A load predicting device and a weather predicting device are connected with an inter-micro-grid communication decision mechanism through fiber communication. The inter-micro-grid communication decision mechanism is connected with an A-zone micro power grid, a B-zone micro power grid, and a C-zone micro power grid. The A-zone micro power grid is connected with the B-zone micro power grid via an AB inter-grid communication line. The B-zone micro power grid is connected with the C-zone micro power grid via a BC inter-grid communication line. The A-zone micro power grid is connected with the C-zone micro power grid via an AC inter-grid communication line. The micro power grid system provides a micro power grid with a capability of operating independent of the large power grid for long time. The micro power grid is thoroughly separated from the large power grid, high in independence, obviously improved in application range and stability, and prevented from being influenced when the large power grid is faulted.