The invention provides an independent microgrid system design method based on a universal gravitation algorithm. The independent microgrid system design method comprises the following steps of S1, establishing an independent microgrid system model with a multi-objective evaluation index; S2, converting the independent microgrid system model with the multi-objective evaluation index into an independent microgrid system model with a single-objective evaluation index; S3, taking accessible draught fan number Num<wt>, parallel-connection string number Num<pv> of photovoltaic cell arrays, and parallel-connection string number Num<bat> of storage batteries as optimization variables; S4, determining an operational control strategy of the independent microgrid system, preferably considering renewable energy generating capacity to satisfy load requirement, and determining charging-discharging states of the storage batteries and the starting and stopping of a diesel generator according to a difference value between the renewable energy generating capacity and the required electric quantity of the load; and S5, solving the independent microgrid system model by the universal gravitation algorithm. The independent microgrid system designed by the design method has the advantages of high economical efficiency, high environment-friendliness, high renewable energy utilization, high power supply safety and reliability, and the like.