Aiming at the problems in environmental monitoring, such as the security of environmental information can not be guaranteed, remote areas are not easy to monitor, and there are blind areas in the use of communication network, this paper uses Beidou’s high-precision spatiotemporal technology and short message communication function, and the powerful graphic analysis function of geographic information system to build a space-sky-terrestrial integration environmental monitoring platform based on Beidou. Combined with the characteristics of the Yangtze River Basin and Dongting Lake, we combined the Beidou system with the relevant professional environmental monitoring sensors to form the space-sky-terrestrial integration environmental monitoring application scenario based on Beidou, then monitor various environmental indicators and send the monitoring data to database for analysis and visualization. The results show that the environmental monitoring platform based on Beidou can achieve 24-hour uninterrupted data acquisition and transmission, and provide data support for scientific management and decision-making.