Surface textures have significant influence on surface wettability. In this paper, a range of fish scales surface textures are produced by using vibration assisted micro milling. The generation principle of the surface textures and their influence on surface wettability are mathematically studied. A new contact model, which considers both liquid infiltration effects and air trapped in the microstructure, is proposed for predicting the wettability of the fish scales surface texture. Machining and hydrophobicity experiments are conducted to validate the model and results indicate that the solid surface hydrophilicity is improved by the fish scales surface textures. Moreover, under the experimental conditions used in this research, the contact angle can be controlled from 30° to 57° by adjusting the parameters that determine the fish scales. The paper concludes that vibration assisted micro milling is an effective method to modify and control surface wettability.