The invention discloses a modular electric distribution box comprising a box body, a support column, a fixing plate, a mounting hole, hinges, a door panel, a
glass window, a buckle lock, a rain cover,an annular mesh plate, a frame, a dust-proof net, a motor, a fixing sleeve, a connecting rod, fan blades, a dry
moisture-proof structure, a mesh cover, fixing strips, a
desiccant layer, mesh holes, aU-shaped base, a first rotating shaft, a rotating guide rail, a sliding slot, a blocking strip, a first
magnet block, a module mounting plate, a flat plate, a terminal socket, a thread sleeve, a through slot, a second rotating shaft, a bearing strip, a
clockwork spring, fixing guide rails, a sliding block, a second
magnet block and a filter screen. The modular electric distribution box has a reasonable structure. A plurality of rotate mounting loading structures and a plurality of fixing guide rails can form a two-layer slideway structure can be formed, and the sliding block is used for slidably installing the module mounting plate so that the switching equipment, the measuring instruments, the protective electrical appliances and the auxiliary equipment can be dispersely distributed andare slidable after installation, the arrangement is convenient, the distance between the appliances is large and the heat dissipation is facilitated.