A cloud operation interface sharing method, a related device includes: displaying, by a first terminal device, a first message sent by a cloud operating system of a second terminal device, where the first message carries first authentication information and address information of the cloud operating system, and the first message informs the first terminal device that the second terminal device authorizes the first terminal device to use the cloud operating system; requesting, by the first terminal device, authentication from the cloud operating system; after the authentication succeeds, establishing, by the first terminal device, a connection to the cloud operating system; receiving, by the first terminal device, interface information sent by the cloud operating system; and switching, by the first terminal device, a currently displayed first operation interface to a second operation interface corresponding to the interface information.