The invention relates to a modular equipment cabinet which comprises a cabinet body and case modules arranged in an up-down direction inside the cabinet body, wherein the cabinet body comprises a frame and a front door and a rear door located outside the frame; the front door is provided with an air outlet; the rear door is provided with an air inlet; each case module is provided therein with a fan; a first heat dissipation channel is formed in the internal space of each case module and runs through the case module in front-rear direction; a second heat dissipation channel is arranged betweenthe adjacent case modules in the cabinet body and run through the cabinet body in the front-rear direction; the top wall of the second heat dissipation channel is formed by the bottom surface of the case module located above; the bottom wall of the second heat dissipation channel is formed by the top surface of the case module located below. The modular equipment cabinet increases the flow area ofthe heat dissipation channels in the entire modular equipment cabinet after using the second heat dissipation channel between the adjacent case modules, so as to avoid failing to transfer a large amount of heat generated by the case modules in time, reduce the aggregation of the heat in the modular equipment cabinet, and improve the overall heat dissipation performance and heat dissipation efficiency of the modular equipment cabinet.