Metal surface microporous treatment method and preparation method of metal-resin composite

The invention relates to the field of metal surface treatment, and discloses a metal surface microporous treatment method and a preparation method of a metal-resin composite. The metal surface microporous treatment method comprises the following steps: (1) forming a porous resin layer on the surface of a metal substrate machining area and forming a protective layer on the surface of a non-machining area, so as to obtain a metal substrate S1 of which the surface is coated with the porous resin layer and the protective layer; and (2) subjecting the metal substrate S1 to anodic oxidation and chemical corrosion, so as to form micropores in the surface of the metal substrate machining area and obtain a metal substrate S2 provided with the micropores. The metal surface microporous treatment method provided by the invention is low in cost, environmentally friendly and wide in application scope; and when the metal-resin composite is obtained through injection molding of the metal substrate obtained according to the m