This dataset comprises comments from the CSI 300 Guba Forum, covering the period from 2015 to 2024. Each entry includes the comment text, the URL of the comment, the type of post, the author's name, the URL to the author's profile, the publication time, and the content of the comment. The data offers insights into investor sentiment, market reactions, and discussions surrounding the CSI 300 index over nearly a decade. This dataset can be utilized for sentiment analysis, market trend studies, and understanding investor behavior patterns.