Closed bus bridge device for preventing short circuit caused by rainwater

The invention relates to a closed bus bridge device capable of preventing short circuit caused by rainwater. The closed bus bridge device comprises a long box body, wherein three rows of pillar porcelain bottles are arranged on the inner bottom surface of the long box body along a length direction, a bus bar is arranged at the top of each row of pillar porcelain bottles, safety intervals are arranged among the three bus bars, the bottom surface of the long box body is respectively provided with a drain hole corresponding to each busbar, the bottom of the long box body is provided with two slideways at the two sides of each drain hole, a movable sliding plate is arranged between the two slideways, and the sliding plate is used for sealing the drain holes. According to the invention, safe operation of a bus bridge can be ensured, and maintenance is convenient.