Metal frame for built-in connection of aluminum alloy structure

The embodiment of the invention provides a metal frame for built-in connection of an aluminum alloy structure. The metal frame comprises a first connecting piece, a second connecting piece, a rubber gasket and a bolt. Wherein the first connecting piece comprises a first concave part and a first butt joint part, and the outer wall of one end of the first concave part is parallel to the bottom surface of the first concave part and extends outwards to form the first butt joint part; the second connecting piece comprises a second concave part and a second butt joint part; the outer wall of one end of the second concave part is parallel to the bottom surface of the second concave part and extends outwards to form the second butt joint part; the first butt joint part and the second butt joint part are adjustably connected through a bolt, the concave surfaces of the first concave part and the second concave part are oppositely arranged to form a containing groove, the end part of the first concave part and the end p