The invention discloses a metal surface treatment process. The metal surface treatment process comprises the steps that chippings are produced, wherein an eutectic alloy with the melting point lower than that of metal to be treated is selected, and the eutectic alloy is processed into the eutectic alloy chippings; ball milling is conducted, wherein the eutectic alloy chippings and strengthening body particles are mixed according to the preset proportion and ball-milled; hot pressing is conducted, wherein the surface of the metal piece to be treated is covered with the ball-milled mixed powder, vacuum hot pressing is conducted after cold pressing, and an eutectic mixed powder hot-pressing layer is formed on the surface of the metal piece to be treated; and friction stir processing is conducted. By applying the metal surface treatment process, the eutectic alloy with the low melting point is melted by the adoption of heat of the friction stir, a solid-liquid interfacial reaction is generated, meanwhile a strengthening phase is introduced, and then solidification is conducted; and the solidified eutectic structure containing the strengthening body particles is completely covered with the surface of the solidified alloy. Due to the fact that the common hardness of the eutectic structure is higher, the strengthening function is played, and the corrosion resistance can be improved as well.