An embodiment of the invention discloses a method for accessing an application portal system on a cloud desktop. The method comprises the steps that: a cloud desktop portal system module receives a user account and a password input by a user, and sends the user account and the password to a cloud desktop AD domain control authentication server module for AD authentication; the cloud desktop portal system module sends an authentication short message request carrying the user account to an application portal system module after receiving AD authentication passing information, and the application portal system module sends a generated first authentication short message to a prestored user terminal corresponding to the user account; the cloud desktop portal system module receives a second authentication short message input by the user, and sends the second authentication short message and the user account to the application portal system module for short message authentication; and a cloud desktop proxy program module is used for logging in the application portal system after the short message authentication passes. The embodiment of the invention further discloses a device for accessing the application portal system on the cloud desktop.