The invention discloses a switch cabinet with inner and outer cabinet bodies, which comprises an inner cabinet body and an outer cabinet body arranged outside the inner cabinet body, wherein both the inner cabinet body and the outer cabinet body are provided with cabinet doors; the top part of the outer cabinet body is provided with a top cover; the bottom part of the inner cabinet body is provided with a base; a cavity is formed between the outer wall of the inner cabinet body and the inner wall of the outer cabinet body; a vent pipe is arranged in the cavity; the vent pipe is clamped on the inner wall of the outer cabinet body via a buckle; the end surface of one side, facing the inner cabinet body, of the vent pipe is provided with a vent hole; and the lower end of the top cover is provide with a support. Ventilation is realized through adopting the vent pipe, the fact that the inner part of the cabinet body is likely to be affected with damp when a vent window structure is arranged is avoided, the cabinet body structure whose inner layer and the outer layer can be adjusted is adopted, the two layers of cabinet bodies can move relatively when needed, a structure with two vertical cabinet bodies is thus formed, and the space for mounting an electric appliance is increased.