The invention discloses an opening and closing top cover for a wagon, which belongs to the technical field of components for wagons. The opening and closing top cover comprises an arc wagon roof, a charging port frame, a driving device, a first top cover, a second top cover, a first eccentric rocker and a second eccentric rocker, wherein the arc wagon roof is arranged on a body of the wagon; the charging port frame is arranged on the arc wagon roof; the two top covers are arranged on the charging port frame; the first top cover is positioned on one side of the charging port frame; the second top cover is positioned on the other side of the charging port frame; the two ends of the first top cover are connected with one end of the first eccentric rocker; the two ends of the second top cover are connected with one end of the second eccentric rocker; the other end of the first eccentric rocker and the other end of the second eccentric rocker are articulated with the body of the wagon; and the driving device is connected with the two eccentric rocker respectively. When goods are loaded, the movable top cover is opened by the drive mechanism; the top cover is closed all the time in the transportation process; and the opening and closing top cover has good sealability such as sand prevention, dust prevention and rain protection.