The utility model relates to the field of electrical equipment, in particular to a distribution box with dustproof and heat insulation functions. The device comprises an outer shell and an inner shell, the inner shell is arranged in the outer shell, and the surface of the inner shell and the inner wall of the outer shell form a cavity; a dust suction pipe is arranged in the inner shell, the dust suction pipe is funnel-shaped, and ash sticking paper is arranged on the inner wall of the dust suction pipe; a plurality of air inlets are formed in the bottom of the inner shell, one end of each airinlet communicates with the air inlet end, and the other end communicates with the outside of the distribution box; a heat discharge port is formed in the bottom of the shell, one end of the heat discharge port communicates with the cavity, and the other end communicates with the outside of the distribution box; a draught fan is arranged on the inner wall of the inner shell, the air inlet end of the draught fan communicates with the interior of the inner shell, and the air outlet end of the draught fan communicates with the cavity. The distribution box not only solves the problem that the distribution box is placed outdoors and cannot remove dust in real time, but also solves the problem that internal components are damaged due to the fact that the temperature in the box rises under the condition that the distribution box is exposed to the burning sun.