In recent years, researchers have found that the hyperspectral image classification method based on dual branch structure can more effectively extract the spectral and spatial features of the image for classification. However, in the dual branch structure, each branch only focuses on refining and extracting spectral or spatial features, with the study on cross-dimensional spectral-spatial feature interaction ignored, and the partial interaction extracted by the two branches respectively is not obvious, which affects the performance of classification. To solve this problem, this study proposes a hyperspectral image classification method based on global attention information interaction. First, the dense connection network is used to divide the image into two branches to refine the spectral and spatial features, respectively, and then the channel global attention features and spatial global attention features are obtained by combining the global attention mechanism (GAM). Finally, an information interaction module is used to realize the interaction of spectral and spatial information, which makes full use of spectral and spatial information to achieve classification. The method proposed in this study has been tested on Pavia University (PU) and Salinas Valley (SV) datasets, respectively. Compared with that of the other four methods, the classification performance of the method proposed in this study is significantly improved.