The invention provides an island detection method for the parallel operation of an inverter, and the method comprises the steps: determining a power mismatching degree of a grid-connected point of a distributed power generation system; comparing the power mismatching degree with a set power threshold value; determining a start timing island detection method according to the difference between thepower mismatching degree and the set power threshold value, detecting an island, and sending a locking signal. According to the technical scheme of the invention, the method solves a problem that a dilution effect, caused by the desynchrony of injection disturbance of an active frequency shift and phase shift island detection method under the parallel operation condition of multiple inverters, further causes the detection failure of the island. Meanwhile, through the judgment of the power mismatching degree of the grid-connected point and the combination of overvoltage/undervoltage and over-frequency/underfrequency island detection, the disturbance is injected into a system only when the power mismatching degree is less than the set threshold value, thereby reducing the impact on the electric energy quality from the disturbance.