Abstract: Composite materials are widely used in aviation, aerospace and other engineering fields. However, composite materials are very sensitive to the impact load. In order to improve the accuracy of the impact localization identification in composite structures in real-time, it is necessary to carry out the online structural health monitoring for the impact load on composite structures. In this paper, for the composite laminate, based on the fact that the closer the two impact positions, the higher the similarity of the received signal's amplitude-frequency characteristics. The method of the wavelet packet transform is used to extract the energy feature vector through the Fiber Bragg Grating (FBG) sensor. The correlation coefficient method is used for the impact localization identification of the composite laminate. Eight impact location identification experiments are carried out for the 480 mm×480 mm composite laminate. The localization error is zero for seven of them; and the percentage error is not more than 6% for the other one.