The invention relates to a metal surface treatment method, in particular to an environment-friendly non-ferrous metal surface treatment method, belonging to the technical field of surface cleaning and surface rust prevention treatment of metal. The method comprises the steps of diluting a metal surface treatment agent with water which is 8-9 times as much as the metal surface treatment agent; adding an acidifying or alkalizing agent to control the PH value of working solution to be 8.0-9.0, and cleaning the surface of non-ferrous metal for 3-4min by ultrasonic waves or in a spraying mode at normal temperature or 50-60 DEG C and drying in a temperature range from 10 DEG C to 120 DEG C; when the method is adopted, nanoscale titanium dioxide and nanoscale silicon dioxide form a protective membrane layer on the surface of the metal, and nanoscale F-doped titanium dioxide and nanoscale silicon dioxide can decompose bacteria on the surface of the metal under the irradiation of sunlight and have high hydrophilcity, so as to fully protect the surface of the metal from being eroded by bacteria and rainwater; therefore, the surface of the metal is protected very well and the protective membrane is formed on the surface of the metal to protect the glossiness of the metal surface.