Lock hook external lock group

The utility model relates to a lock assembly used for refrigerators. One of splines of the circumference of a lock core seat hole is depressed with a certain dimension; the excircle position of a lock core is provided with a convex pin-shaped table, wherein, one part of which is positioned in the lock core seat hole; a lock hook which is provided with a concave matched with the convex pin-shaped table is sheathed on the excircle position of the lock core; thus the defects of few purposes, easy damage, high cost and complicated assembly when the lock hook is positioned at the tail end of the lock core can be overcome.