Metal plating method and pretreatment process

The metal plating method comprises the following steps: (1) pretreatment: placing pretreated metal in a sulfuric acid solution barrel to ensure that the whole metal submerges the sulfuric acid solution, and the concentration of sulfuric acid is controlled to be 100g/L-250g/L, (2) moving a heating device to the bottom of the sulfuric acid solution barrel, and heating the sulfuric acid solution barrel to heat the metal, (3) putting the metal in the step (2) into a silane ketone emulsion barrel, completely immersing the metal in the silane ketone emulsion barrel into the silane ketone emulsion barrel, integrally rotating the silane ketone emulsion barrel at the same time, rotating the silane ketone emulsion barrel for two circles every other 5 minutes for 30 minutes, and then activating the silane ketone emulsion barrel for 30 minutes, so that the metal in the silane ketone emulsion barrel is completely immersed into the silane ketone emulsion barrel, and the metal in the silane ketone emulsion barrel is complet