The embodiment of the invention discloses access authentication method and device, wherein the access authentication method comprises the following steps of: after user equipment successfully passes extension protocol authentication, distributing an authorization code corresponding to user identification information to the user equipment, and sending successful extension protocol authentication information containing the authorization code to the user equipment; receiving the access request information of the user equipment, and authenticating the user equipment according to the authorization code contained in the access request information and the to user identification information. Thus, the quick authentication of the user equipment is realized, and the efficiency of access authentication is increased.