In this study, network intrusion detection method of information entropy measurement-based LLE and weighted kernel extreme learning machine with CPSO (IEMLLE-CWKELM) is proposed for network intrusion detection. First of all, this article proposes an information entropy measurement-based locally linear embedding (IEMLLE) algorithm to reduce the features of network intrusion data. The IEMLLE algorithm is a dimensionality reduction algorithm based on information entropy measurement. The discrimination of the distribution of sample data of the different classes based on IEMLLE is higher than that based on locally linear embedding (LLE) algorithm. Moreover, this article proposes a weighted kernel extreme learning machine (CWKELM) algorithm, among which the use of kernel functions instead of hidden layer random feature maps containing activation functions is beneficial for improving the nonlinear processing ability and robustness of weighted extreme learning machine, and the chaos particle swarm optimization (CPSO) algorithm is proposed to optimize the penalty factor and the kernel parameter of weighted kernel extreme learning machine. The experimental results show that IEMLLE-CWKELM is the higher network intrusion detection accuracy than LLE-CWKELM, LLE-ELM, and principal component analysis- extreme learning machine (PCA-ELM).