The invention discloses an internet-based vehicle management system. The internet-based vehicle management system comprises a permanent client, a server, an execution mechanism and a temporary client,wherein information is transferred between the execution mechanism and the server, information transit and transfer are performed between the permanent client and the execution mechanism by the server, information is transferred between the permanent client and the server, the server is used for achieving one-way communication with the temporary client, and information communication is performedbetween the permanent client and the temporary client. A method of the internet-based vehicle management system comprises steps of permission authorization, navigation preparation, site-entering declaration, visitor applying, site-entering program, information inquiry, off-site program and information processing. By internet data transmission, vehicles of an owner and a visitor entering resident are automatically declared, the property management approves by the server, so that the vehicle of the resident can be traced, the owner can be accurately contacted, the site-entering speed is increased, the management level is improved, and the vehicle is intelligent managed.