An embodiment of the invention provides a device and a method for visualizing a disconnector switch in a solid insulation looped-network cabinet. The device comprises a light collection and lighting analysis system and a fracture peeping subsystem. The light collection and lighting analysis system is used for collecting light emitted from an external light collection hole of the solid insulation looped-network cabinet, and transmitting the collected light into an insulated sleeve of the solid insulation looped-network cabinet to light up the disconnector switch. The fracture peeping subsystem is used for collecting images of the disconnector switch, and transmitting the images of the disconnector switch to the position of the fracture peeping hole of the solid insulation looped-network cabinet to enable operators to observe. The device and the method have the advantage that a technical scheme for visualizing the disconnector switch in the solid insulation looped-network cabinet is provided to fully guarantee safety of maintainers and the solid insulation looped-network cabinet.