The utility model discloses a power cabinet with a dustproof function. an air inlet is formed in the top of the power cabinet; a dust collection chamber is arranged at the top end in the power cabinetcorresponding to the air inlet; a dust collecting bag is arranged in the dust collecting chamber; a secondary filtering cavity is formed in the power cabinet; the second-stage filtering cavity is provided with a convex edge at the periphery and is hollow; a sealing strip and a filtering cover are arranged at an inlet of the second-stage filtering cavity, the filtering cover is connected with thesecond-stage filtering cavity through a hinge, the filtering cover is connected with the second-stage filtering cavity in a clamped mode through a protrusion, a buckling handle is arranged on the filtering cover, a second-stage filter is arranged in the second-stage filtering cavity, and a surface net, a primary filter and a medium-efficiency filter are arranged on the second-stage filter; according to the utility model, through the arrangement of the secondary filter, air in the electric power cabinet can be further filtered, so that the air in the electric power cabinet is cleaner, and the interior of the electric power cabinet is cleaner; through cooperative use of the cooling fins and the cooling pipes in the second embodiment, the heat in the power cabinet is reduced through heat transfer; the device is simple in structure, ingenious in conception and convenient to popularize.