SK-301 outdoor communication cabinet is with fan cooling system. The lower part of the cabinet is the battery compartment and the upper part is the equipment compartment. The cabinet sheet metal structure is a double-layer insulation structure, and the middle of the double-layer sheet metal is filled with insulation materials. The phenolic foam insulation board with non-combustible performance is adopted. The insulation performance is good and the protection level reaches IP54, so that the cabinet can withstand severe cold and heat, rain, snow, wind and sand, and provide a good working environment for the equipment inside the cabinet in a bad environment.