The high-formwork support is to form and maintain newly poured concrete so that there should be no deformation in the shape. Deflection and shrinkage should be minimum. The intelligent monitoring of high-formwork support based on big data has been dramatically promoted with the advancement of science and technology. The standard of living is constantly improving, and safety is frequently the top priority. The construction industry pays close attention to the safety of high-formwork support during the construction process. Traditional high-formwork support monitoring is based on manual observation and measurement, which is not only time-consuming and labor-intensive but also produces insignificant monitoring data. Because of the strict requirements for pouring quality and construction safety, the traditional high-formwork support has been unable to meet the demand. We must combine information technology to provide the best monitoring means for high-formwork support and effective guarantees for building construction safety. In this paper, we propose an intelligent high-formwork support monitoring system. Every two seconds, the system can obtain equipment monitoring data, which is automatically transmitted. It transmits monitoring data from the collector to the database, thereby avoiding high-formwork support accidents. Decision trees are also used in the analysis of monitoring data. As a result, three decision rules emerge. The main advantages of the intelligent high-formwork support monitoring system are that it is frequently monitored and allows for real-time monitoring. The proposed intelligent high-formwork support monitoring system ensures the safety of the high-formwork support during construction.