The present disclosure relates to an authentication method and an authentication device for a wireless router. The authentication method may first generate a corresponding 2-dimensional barcode with BSSID and PIN codes of the wireless router. The authentication method may scan the 2-dimensional barcode and may resolve the scanned 2-dimensional barcode to corresponding BSSID and PIN codes. The authentication method may correlate the corresponding wireless router according to the BSSID, may activate a WPS process of the wireless router, and may access a network provided by the wireless router via the PIN code. Thereby, a user can access a wireless router and may go online by using a mobile terminal to scan a 2-dimensional barcode. As a result, the mobile terminal can be conveniently and quickly connected to a wireless router, which may greatly reduce the user's operations and results in great convenience for users.