The invention provides a metal workpiece surface treatment method. The metal workpiece surface treatment method comprises the following steps that firstly, a metal workpiece is immersed in an acid solution to be soaked; secondly ultrasonic cleaning is carried out on the metal workpiece; thirdly, the metal workpiece is rinsed through clean water; fourthly, the metal workpiece is dried; fifthly, passivating treatment is carried out on the metal workpiece; sixthly, the metal workpiece is rinsed through clean water; seventhly, the metal workpiece is immersed in aqueous alkali; eighthly, the metalworkpiece is rinsed through clean water; ninthly, the metal workpiece is rinsed through purified water; and tenthly, the metal workpiece is dried. The metal plate workpiece treated through the treatment method is good in corrosion resistance, the tensile force and the hardness are improved, protrusion and burr phenomena do not occur through surface treatment, and requirements of high-tech productsand precision products are met.