The invention relates to a preparation method of a metal material surface super-hydrophobic film, and belongs to the technical field of metal material surface super-hydrophobic treatment. The method includes the steps that a metallic matrix is pretreated, and oil contamination and oxide on the surface of the metallic matrix are removed; the metallic matrix obtained after impurity removal serves as a negative electrode, a noble electrode material, a pure Ni electrode or a slicker solder alloy electrode serves as a positive electrode, the distance of the electrodes is 0.5 cm to 2 cm, the electrodes are placed into electroplate liquid to be electroplated, a direct current power source is adopted for electroplating, the electric current density is controlled to range from 50 A/dm<2> to 70 A/dm<2>, washing and blowing are carried out, and the electroplated metallic matrix is obtained; and the electroplated metallic matrix is soaked into an ethanol solution of long-chain fatty acid for 2 min or above, modification and drying are carried out, the metal material surface super-hydrophobic film is obtained, the morphology of the film is even and irregular, the roughness value is 1.732 micrometers to 2.036 micrometers, and the dewatering angle reaches 150 degrees or above. The super-hydrophobic film has the anti-sticky, self-cleaning and antiseptic performance and other performances, and is widely applied to life and industries.