Landing leg assembly and engineering machinery

The utility model belongs to the technical field of mechanical equipment, and discloses a landing leg assembly and engineering machinery, the landing leg assembly comprises a mounting seat, a landing leg body, a first locking piece and an elastic reset piece, the mounting seat is provided with a first fixing hole, the landing leg body is arranged on the mounting seat and is provided with a second fixing hole, and the first locking piece and the elastic reset piece are arranged on the mounting seat. The supporting leg body can rotate relative to the mounting base and has an unfolding position and a folding position, and the first locking piece is suitable for penetrating through the first fixing hole and the second fixing hole when the supporting leg body rotates to the unfolding position so that the supporting leg body can be fixed to the unfolding position. The elastic reset piece is suitable for providing force for forcing the supporting leg body to rotate to the folding position and keeping the supporting