The invention provides a method for building a desktop cloud virtual trust safety wall. A TCM serves as a trust root, a safety wall trust chain and a basic trust chain together form a two-dimensional trust chain, the virtual trust safety wall can move along with virtual desktops synchronously, the two-dimensional trust chain is built, and a trust relationship can be expanded to a whole desktop cloud system from the trust root through the two-dimensional trust chain. By means of a virtual trust safety wall system structure, on the basis of a trust computing basis platform, a virtual trust safety wall is built for each virtual desktop, and a desktop visit method high in safety and instantaneity is provided for business application. For enhancing the safety of desktop cloud, the two-dimensional trust chain is formed by the safety wall trust chain and the basis trust chain, and the trust relationship is expanded to the whole desktop cloud system from the trust root. Aiming at dynamic characteristics of the cloud environment, the virtual trust safety wall has the capability of moving along with the virtual desktops dynamically, and the aim of 'safe service' can be achieved.