This dataset is Weibo Sentiment Index Data related to the Flood in Shouguang, China. Using web crawlers and Weibo API, original Weibo messages were collected with “Shouguang” as the keyword. The following information was extracted: user ID, timestamp (i.e., the time when the message was posted), text (i.e., the text message posted by a user), and location information. Then sentiment index was calculated by ‘Tencent’ natural language processing (NLP) API. The data format is Excel. The spatial scope is China. The temporal range is 00:00 on August 19 2018 and 00:00 on August 28 2018. There are 77,581 Weibo texts.