In order to prevent the interference of power network disturbance and improve the accuracy of island and the disturbance identification, this paper proposes a new identification method of the island and the disturbance, which can reduce the non-detection zone and the active power disturbance. When the voltage fluctuation is detected, a periodic reactive disturbing current which affects the voltage frequency of the point of common coupling is applied. The high frequency component of the common coupling point voltage frequency signal decomposed by wavelet analysis is put into the neural network as the characteristic component to identify. Theoretical analysis and simulation results prove that the method can accurately identify island and grid disturbances.