A web server and a network connection method for local network log-in are provided. The method includes receiving a first calling signal from a mobile communication device through a mobile phone network, identifying a phone number of the mobile communication device according to the first calling signal from the mobile communication device, and permitting the mobile communication device to access an operating interface by using a class C network uniform resource locator through a local area network, and the phone number is contained in the class C network uniform resource locator. Accordingly, users can connect to the local network easily and safely through the provided web server.