Wireless network connecting method, device and system

The embodiment of the invention discloses a wireless network connecting method, device and system belonging to the network security field. According to the invention, a first access request is sent to a wireless access point; an authentication server sends a second access request; whether the wireless access point belongs to a trust wireless access point is authenticated, when the wireless access point belongs to the trust wireless access point, first identity authentication is carried out with a user terminal, a main secrete key is generated through negotiating with the user terminal; the main secrete key corresponding to a user name is sent to the wireless access point; an encrypted wireless network connection is built by negotiating with the user terminal according to the main secrete key; the problems that the data transmitted to the counterfeit public Wi-Fi by the user terminal and the data in the user terminal are in security threat are solved; only the trust wireless access point can obtain the secrete