An equipment cabinet and a slidable-and-rotatable rack assembly are provided. The equipment cabinet includes a housing and a rack assembly. The rack assembly is disposed in the receiving space of the housing. The rack assembly comprises a first slidable tray, at least two first rail assemblies, a frame, and a first rotation shaft assembly. The first rail assemblies are connected with the first slidable tray and the housing respectively and configured for allowing the first slidable tray to be moved relative to the housing. The frame is carried by the first slidable tray and has a base plate. The first rotation shaft assembly is coupled with the base plate of the frame and the first slidable tray and configured for allowing the frame to be rotated relative to the first slidable tray after the frame carried by the first slidable tray is drawn out.