In order to explore the data sharing in the cloud platform, which is easy to manage and use data, but also ensures the safety of the data, on the basis of data sharing, the study of cloud platform wireless sensor network monitoring system for environmental monitoring methods is carried out. The prototype system of environmental monitoring cloud platform is built, which achieves the support and management of the sensor data and file data. The sensor data, in the system, adopts the OGCSWE standard, and provides the corresponding interface for other systems. In the platform, it is capable of querying the data needed by users, and making the paid or unpaid data sharing, which is convenient for users to use more and more useful data. The test results show that, the system runs stably and runs normally at the same time of multi users landing, and the data acquisition speed is fast. Based on the above findings, it is conclude that, under the condition of relying on distributed computing and parallel computing in cloud platform, the system can effectively monitor in a wide range and process the data quickly to achieve the hardware and software services required by users.