The invention discloses surface-treated
metal, a surface treatment method of the
metal and a
metal and
resin composite body. A hole used for filling of resin perpendicularly extends towards the interior of the metal from the surface of the metal, any position of the hole is expanded outwards or shrunk inwards, a cavity structure with the unequal hole
diameter is formed, and through the cavity structure, the metal and the resin can form a better nano
anchor bolt effect, and the connecting strength of the metal and
resin composite body can be effectively improved; a multistage
anodic oxidation method is adopted in the metal to treat the surface of the metal, the method is efficient, environment-friendly, reliable and high in
repeatability, bonding force between a resin layer and a metal base material of the metal
resin composite body is good, the excellent
tensile shear strength is achieved, the resin source is wide, the method is suitable for industrial large-scale production, and the problem that according to an existing method, the defective percentage stays at a high level is solved.