With the gradual liberalization of China's fertility policy and the popularization of maternal health management, the demand for high-quality obstetric medical resources is increasing. In recent years, the digital obstetric system has paid more and more attention to the information management, especially fetal monitoring data. This research combines the Internet of Things and Cloud Service technologies to design a multi-platform obstetric information management system, which realizes the informatization and cloud analysis of fetal heart monitoring data. This system is mainly divided into three layers, including: controller layer, management layer and application layer. The controller layer is the wireless control interface of the fetal monitoring device based on the TCP protocol. The management layer is mainly responsible for the caching, storage and cloud synchronization of fetal monitoring data. The application layer implements report printing, log management, cloud analysis and device management. Moreover, based on the application layer, this work designs a web client and an Android client to realize the cross-platform interaction of obstetric information system. This system will greatly facilitate the management of pregnant women and help the intelligence of the obstetric information system.