Web singe-point login implementing method and device

The invention discloses web singe-point login implementing method and device. The method comprises the steps of presetting a proxy server of a client to be a fort machine; setting a cross-domain access cookie information for the client through the fort machine; directly sending the cross-domain access cookie information to the fort machine through the client in case of single-point login; performing single-point login through the client according to a response data packet including the user information from the fort machine. With the adoption of the method, a special login system is not needed to be installed in the client, so that the complexity of single-point login can be effectively reduced; in addition, the client can perform single-point login simply through the cross-domain access cookie information and the response data packet, and a browser of the client is not limited; therefore, various browsers capable of analyzing the cross-domain access cookie information and the response data packet apply, and as a result, the adaptability is improved.