The invention discloses a method for improving uniformity and glossiness of the metal surface. According to the method, a sand blasting machine is used for spraying out a sand material, the included angle between the spraying direction and a normal line of the metal surface of a base material is 90 degrees, a negative pressure is produced at the front end of a sand outlet through air flow blown out of a high-pressure fan, so that the sand material falling from a sand nozzle opening is sucked to be blown to the surface of a workpiece under pushing of the subsequent air flow; due to the fact that sand nozzles are fixed in hole diameter and the arrangement interval between every two sand nozzles on sand nozzle bodies is fixed, the uniformity of sand blowing processing is guaranteed; and a good working environment is provided for an operator, in addition, the uniformity and the glossiness of the surface of a product are improved, the appearance is attractive, and the decorative effect is good.