The invention discloses a single-/three-phase multi-micro-grid region dynamic partitioning method. Based on multiple micro grids of a single-/three-phase hybrid structure, a region dynamic partitioning method for solving an optimal interconnection combination scheme and implementing switching process control for single-/three-phase multiple micro grids is put forward on the premise of considering the stability and reliability of system running. First, interconnection combination schemes satisfying the requirement of spare capacity are screened out preliminarily with system power surplus as a pre-judgment criterion; then, a fuzzy multi-objective decision is made based on an energy storage adjustment ability index, a region main energy storage stability margin index, a minimum unbalance degree index and a partitioning operation risk degree index to get an optimal interconnection combination scheme; and finally, state switching is performed based on the selected optimal interconnection combination scheme. Through the method, region dynamic partitioning and optimized operation of single-/three-phase multiple micro grids can be realized effectively.