The present invention discloses an island microgrid frequency control method based on a random acceleration particle swarm algorithm. The method concretely comprises: the frequency variation [delta]f of a microgrid is taken as input variable, and an optimal output membership function parameter is found through optimization of the random acceleration particle swarm algorithm; the obtained optimal parameter is configured to replace an output membership function parameter in an original fuzzy logic inferer; the fuzzy logic inferer employs a new output membership function parameter to perform fuzzification processing of the PI controller output quantity, the ambiguity resolution operation is performed, PI controller parameters Kp and Ki are obtained through scale transform, and the parameters in the current PI controller are replaced. The PI controller output controls the micro-gas turbonator to rotate to realize frequency regulation in the microgrid. Through combination of the particle swarm algorithm and the fuzzy logic algorithm, the island microgrid frequency control method based on the random acceleration particle swarm algorithm forms combination intelligent optimization, the optimization speed is obviously faster than that of the genetic algorithm, and the performances are improved.