Abstract: The performance of abnormal acoustic source location technology based on acoustic sensor array is not only related to the processing algorithm, but also dependent on the sensor array model. Increasing the number of sensors to improve the estimation performance often leads to the increase of cost. In this paper, an array virtual expansion method based on the non-redundant fourth-order cumulant of a uniform planar array is proposed. This method can be adopted to improve the performance of the array without changing the hardware design. Compared with the low-order cumulants, the high-order cumulants can increase the number of sensors and the number of distinguishable sources by extending the array virtually, and can improve the location estimation performance. In addition, since the high-order cumulants only contain the information of non-Gaussian components, the expanded array shows better anti-Gaussian-noise performance. Moreover, the complexity of the algorithm is reduced and the real-time performance of the localization method is improved by removing the redundancy and dimension reduction of the cumulant matrix. The simulation and field test results show that the proposed method can be adopted to locate more acoustic source signals than the number of real sensors. The localization accuracy is significantly improved when the signal-to-noise ratio is low, the resolution of the localization method is also improved, and the calculation amount of the algorithm can be effectively reduced.