Dinning table and foldable table leg device thereof

A foldable pivot leg assembly for a banquet table includes a pair of table supporting frames foldably affixing to a tabletop, wherein each of the table supporting frames includes a leg frame having an upper end portion for pivotally mounting between two tabletop supports, and a supporting frame including two supporting arms each having a lower retention portion and an upper supporting portion for transversely and pivotally mounting at the respective tabletop support to rigidly support the top panel, and a folding frame pivotally connected between the retention portions of the supporting arms and the leg frame. Therefore, in a folded position, the leg frames are pivotally and inwardly folded for resting under the top panel, and in an unfolded position, the leg frames are firmly and rigidly supported by the supporting frame and pivotally and outwardly folded for perpendicularly standing under the top panel. It is simple-structured, fast-assembled, and convenient-operated.