Method, system and apparatus for automatically connecting to WLAN

Disclosed is a method for automatically connecting to a wireless local area network (WLAN) including: automatically detecting, by a terminal, whether a wireless signal of the WLAN exists; sending, by the terminal, a safety verification information acquisition request to a wireless device corresponding to the WLAN when the wireless signal of the WLAN is detected and when the information of the WLAN matches information of a prestored WLAN, the acquisition request including application server information; acquiring, by the wireless device, safety verification information corresponding to the WLAN from an application server corresponding to the acquisition request, and sending the safety verification information to the terminal; and performing, by the terminal, safety verification on the WLAN according to the safety verification information, and accessing a network after the safety verification is passed.