The invention discloses a double-
metal bonding method and structure. The method comprises the following steps that one machined and formed aluminum piece is provided; the machined and formed aluminum piece is placed in a die-
casting die, the machined and formed aluminum piece is coated with one
magnesium metal liquid, die-
casting forming is carried put, the
magnesium metal liquid forms one
magnesium metal piece, and the magnesium metal piece and the machined and formed aluminum piece are clamped in a clamping and
hooking mode; and after the magnesium metal piece and the machined and formed aluminum piece are combined,
coating protection is carried out on the magnesium metal piece and the machined and formed aluminum piece, one structure is machined in the machined and formed aluminum piece, and highlight treatment and
anodic oxidation are carried out in the structure. According to the double-metal bonding method and structure, the structural inner wall of the aluminum piece or an
aluminum metal piece is machined and formed through highlight treatment, and a
smooth surface can be obtained after double-metal combination, so that time-consuming
grinding is reduced, and surface shrinkage limit and air holes are reduced; and according to the double-metal bonding method and structure, the purpose of double-metal combination can be achieved in a mode of direct connection of plastic or a surface nano structure or double metal.