The utility model relates to a switch board of area heat dissipation function, including the cabinet body, be equipped with heat dissipation mechanism on the cabinet body, heat dissipation mechanism includes exhaust fan, main ventilation pipe, a plurality of branches ventilation pipe and the tube head that induced drafts, the exhaust fan is installed the top of the cabinet body is equipped with branch's mouth of pipe on the main ventilation pipe, branch's ventilation pipe passes through the slewing mechanism parallel connection on branch's mouth of pipe, and the tube head equipartition that induced drafts is installed on branch's ventilation pipe, slide kit has interior ventilation pipe in branch's ventilation pipe, and the equipartition has main inlet scoop on branch's ventilation pipe, and the equipartition has vice inlet scoop on the interior ventilation pipe, and the interval of main inlet scoop equals with the interval of vice inlet scoop that be equipped with anti -drop mechanism between branch's ventilation pipe and the interior ventilation pipe, anti -drop mechanism includes throat and retaining ring. The utility model discloses simple structure, convenient operation, and do not influence electrical components's installation and maintenance can also utilize the limited amount of wind pointed for the heat dissipation of airing exhaust of the big electrical components of production of heat, improves load greatly electrical components's ventilation cooling efficiency of high -power.