Machinery heavy load leg board

A machinery heavy load leg board comprises a loading board. A fixed shaft is arranged below the middle portion of one side of the loading board. A quadric rotating arm is arranged on the right side of the fixed shaft and fixedly connected with the loading board. The fixed shaft is fixedly connected with the quadric rotating arm. A rotating arm is arranged on the left side of the fixed shaft. A sliding shaft is arranged on the left side of the rotating arm. A connector connecting piece is arranged on the left side of the sliding shaft. The sliding shaft is fixedly connected with the connector connecting piece. A sliding rail is arranged below the left side of the loading board. One end of the sliding shaft is arranged in the sliding rail. A locking board is arranged below the rotating arm. A locking switch is arranged below the locking board. The top portion of the locking switch is fixedly connected with the rotating arm. Positions below the fixed shaft and the sliding shaft are respectively provided with a disk gear. The upper portions of the disk gears are respectively fixedly connected with the fixed shaft and the sliding shaft. The lower portions of the disk gears are fixedly connected with the locking board. The whole leg board is in a locked state when the upper portions and the lower portions of the disk gears are closed, and time for an operation is saved.