The present invention provides a wireless network base station which is adapted to receive a 3G or 4G mobile communication network and can be used as a mobile network sharing device of Wi-Fi sharing. The wireless network base station comprises a communication module, an input unit, a processing unit and a random password generation module. The communication module is used for receiving a 3G or 4G communication signal and converting the signal into a Wi-Fi signal for sharing, and establishing a Wi-Fi connection with an external electronic device in a wireless way. The input unit is arranged on the wireless network base station and is used for generating an input command. The processing unit is coupled to the input unit and is used for determining the connection between the communication module and the electronic device. When the processing unit receives the input command, a notification signal is correspondingly generated according to the input command. The random password generation module is coupled to the processing unit and is used for receiving the notification signal and generating at least one group of new Wi-Fi connection passwords according to the notification signal to replace original Wi-Fi connection passwords.