The invention provides a surface treatment technology for a copper-aluminum bi-metal material. The surface treatment technology comprises the first step of hot dipping oil removal, the second step ofwashing, the third step of alkaline washing, the fourth step of washing, the fifth step of anodic oxidation, the sixth step of high-temperature water sealing, the seventh step of washing, the eighth step of tin plating, the ninth step of washing and the tenth step of drying, wherein in the eighth step of tin plating, 30-50 g/L of stannous mono-sulphate, 120-150 g/L of sulfuric acid, 10-20 g/L of an X brightener and 15-25 g/L of a DS cylinder opening agent are adopted, the current is controlled to range from 0.8 A/dm<2> to 1.2 A/dm<2>, and the temperature is controlled to range from 15 DEG C to25 DEG C. Anodic oxidation is conducted on a copper-aluminum composite row firstly, a layer of dense insulation aluminum oxide is formed on the aluminum surface, the aluminum element is protected, the aluminum element is prevented from participating in the later electroplating process, and the copper surface is activated on an anode; and the copper-aluminum composite row is directly subjected totin electroplating, the middle zinc dipping and copper preplating procedures are reduced, and the electroplating protection effect is achieved.