The invention discloses an off-grid type microgrid energy management method for a battery containing sodium and sulfur. According to the method, mainly through a difference value result between a distributed new energy generating capacity and load energy consumption in a microgrid system, and through a combination with an energy management strategy flow chart, allocation power of an energy storage unit at various conditions is given. Charging control and discharging control is performed according a power algorithm of the method, charging for an important load in the system is guaranteed, an electricity demand of a non-important load is satisfied on the basis of the important load power supply, and the utilization rate of distributed new energy is improved.