The invention discloses a text enhancement semantic classification method and system based on a convolutional neural network, and belongs to the technical field of natural language processing, and themethod comprises the following steps: S1, collecting a training sample; s2, performing pretreatment; S3, segmenting words S4, constructing a word segmentation matrix; S5, enhancing data S6, trainingby using model. A new text word vector matrix with the same label can be generated so that a small amount of label data in an original data set is enhanced to a great extent, the sample capacity is expanded, and the effects of improving the robustness of a subsequent model, improving the accuracy, the accuracy rate and the recall rate and the like are achieved; a model is trained through the improved convolutional neural network, and texts under government affair public opinion Chinese text labels can be effectively classified and judged; the invention is suitable for solving the semantic category classification problem of the Chinese text, and is also suitable for solving other classification problems such as sentiment dichotomy.