The invention discloses a modularized cabinet, and the cabinet comprises a cabinet frame. The cabinet frame is formed by the combination of an upper integrated guide rail, a lower integrated guide rail, a left side plate, and a right side plate. The front of the cabinet frame is provided with a
front panel, and the back of the cabinet frame is provided with a rear panel. A plurality of function modules are inserted between the upper and lower integrated guide rails. The front and back panels, the upper and lower integrated guide rails and the left and right side plates jointly form an isolation cavity, and the isolation cavity is used for the
electromagnetic shielding and salt mist isolation for a function module. Cover plates are disposed above the upper integrated guide rail and below the lower integrated guide rail. Cooling channels are formed between the cover plates and the upper and lower integrated guide rails, and are used for the circulating of cooling air flows, so as to cool the function module.