Multifunctional low-voltage distribution box with built-in side wall waterproof structure

The invention discloses a multifunctional low-voltage distribution box with a built-in side wall waterproof structure. The distribution box comprises a cabinet body, the cabinet body is of a cuboid structure, the cabinet body comprises side walls, a top plate arranged on the side walls and a bottom plate arranged under the side walls, the side walls are provided with air inlet windows, each air inlet window is composed of a plurality of outer rib plates, outer air holes are formed in gaps between every two adjacent outer rib plates, and the upper edges of the outer air holes extend outwards toform arc-structure waterproof edges; a waterproof plate is mounted in the inner side of the air inlet window; the waterproof plate comprises a first side plate and two second side plate; the two second side plates are perpendicularly arranged in the two corresponding sides of the first side plate respectively, the outer end portions of the second side plates are folded outwards to form a fixed plate, and the first side p