The utility model discloses a fodder package backing plate finishing device, including the backing plate storehouse, advance backing plate mouth, cylinder and solenoid valve, the bottom in backing plate storehouse sets up to the tray, the lateral wall in backing plate storehouse be that rear panel, fixed side board and activity side board enclose in proper order to connect and form, the preceding of backing plate storehouse sets up to advancing the backing plate mouth, the backing plate is placed on the tray through advancing the backing plate mouth, the backing plate storehouse just is being provided with the cylinder on the lateral part support to activity side board, the board is perpendicular to the side of the piston rod of cylinder and the activity is connected, the cylinder passes through the solenoid valve and controls. Placing the backing plate on the tray through advancing the backing plate mouth, carrying out primary settlement to the backing plate and align through the posterior lateral plate is preferential, opening the actuating cylinder operation through the solenoid valve, drive activity side board carries out the secondary arrangement to the backing plate and aligns, move about freely and quickly twice arrangement and make the quick arrangement of backing plate neat, and greatly reduced worker's human labor power, reduce backing plate arrangement time and fork truck running cost.