Linkage locking mechanism for trailer breast board

The utility model discloses a linkage locking mechanism for a trailer breast board in the technical field of vehicle transportation. The linkage locking mechanism comprises a breast board, the rotating disc is located in the middle of one side of the breast board, and connecting pieces are symmetrically fixed to the side, away from the breast board, of the rotating disc; the first end of the rotating shaft is fixed in the middle of the rotating disc, and the first end and the second end of the rotating shaft are rotatably clamped on the breast board; the lock rod connected through the connecting piece can be driven to rotate around the pin rod under the driving of the rotating disc, and when the second end of the pin rod rotates to be separated from the lock grooves in the mounting frames located on the two sides of the breast board, unlocking is completed. And when the second end of the pin rod is rotated to be inserted into the locking groove, locking is completed, convenience is achieved, and stability is