The invention provides a vehicle positioning and parking lot parking space state management method and system. The method of the invention includes the following steps that: the entrance, exit, passages and parking spaces of a parking lot are marked with RFID electronic tags; an RFID vehicle-mounted terminal is arranged at a suitable position of a vehicle; and the RFID vehicle-mounted terminal reports read legitimate electronic tag IDs and reading time to a cloud platform through a communication module; and the cloud platform saves vehicle location information and parking lot parking space status information and updates the information periodically in real time, so that a query terminal can use the information. The system of the present invention includes RFID electronic tags, an RFID vehicle-mounted terminal, a vehicle service cloud platform, an inquiry terminal, and electronic signages. With the method and system provided by the invention adopted, vehicle positioning and parking lotparking space state accurate management and reservability are realized. The vehicle positioning and parking lot parking space state management method and system have the advantages of high accuracy, low cost, simple structure, easiness in deployment and maintenance, high concentration of the cloud platform, universality, compatibility and high extensibility.