The utility model discloses a canning pet food's production line, it includes workstation, support, actuating mechanism and link joint. This link joint comprises a plurality of unit spares, this unit spare by the connection piece with lie in this connection piece and form with the first rotation portion and the second rotation portion of one side. The one end of connection piece is equipped with first arc portion, and the other end is equipped with second arc portion. First rotation portion and second rotation portion are equipped with the through -hole, set up the round pin axle in this through -hole to this rotation who realizes two rotation portions. The mutual overlap joint of first arc portion and second arc portion, this first arc portion and second arc portion obstruct the antiport of rotation portion. Even a jar body bears on the link joint, the link joint and be located the link joint on the jar body the accurate operation of the arm of being convenient for still keeps leveling.