The invention provides a cloud-computing-based parking lot management system which comprises a vehicle information collecting subsystem, a thread management subsystem, a resource allocation subsystem, a cloud equipment subsystem, a mobile network interface subsystem and an automatic control subsystem. The could-computing-based parking lot management system can realize interaction with an intelligent cellphone client side, a cloud computing platform is taken as a processing architecture, a big data platform is taken as an information basis, resource distribution, data processing and request response are performed on the basis of service threads, efficient distribution and reasonable utilization of resources are realized by dividing static and dynamic service threads, own running laws of a parking lot are fully met, and high instantaneity requirements on service in the process of traveling can be met. The cloud-computing-based parking lot management system is supportive of a series of intelligent application scenes like parking space vacancy prediction inquiry, parking space optimized selection, incoming and outgoing path planning, vehicle collecting navigation and mobile payment of parking fee.