The invention discloses an automatic nosql cluster configuration system and method based on cloud computing. The automatic configuration system comprises a decision analysis module, a cloud communication module, an nosql management module, a cluster monitoring module and a cloud platform, wherein the cluster monitoring module acquires motion state parameters of an nosql cluster in real time, sends the parameters to the decision analysis module for decision analysis and sends a command for adjusting the nosql cluster to the nosql management module according to the analysis result, and the nosql management module configures the adjusted nosql cluster. With the adoption of the system and the method, high concurrency, extendibility and dynamic scalability required by storage and management of cloud computing big data in the prior art are realized, load condition changes can be responded dynamically, burdens of management staff can be reduced, and the utilization rate of system resources can be increased.