A microgrid system and a control and generated power prediction method thereof are provided. The microgrid system includes a renewable energy power generation system, an energy storage system, a userload system, a diesel engine set and a control system, wherein the user load system divides the load into controllable load and uncontrollable load to predict a trend, and calculates the peak and valley power consumption of the load. The controllable load can be removed in case of an accident state or insufficient output of the renewable energy. The energy storage system is configured to store theexcess power and store the energy during a valley period and supply the energy during a peak period by using the peak-valley difference of the grid electricity price. During the generated power prediction, a photovoltaic power generation system achieves two calculation ways according to whether actually measured data is available. The method utilizes the renewable energy to ensure reliable powerconsumption of users on islands and in remote areas, reduces the cost of electricity for users, reduces environmental pollution, and switches on or off the load according to the change of power load,maintains the self-balancing of the microgrid system.