The invention discloses a high-haze colored ultra-thin high-frequency cover film and a preparation method thereof, including a colored ink layer and a high-frequency adhesive layer. The colored ink layer is located above the high-frequency adhesive layer, and the colored ink layer is provided with at least one layer. A hardness of the colored ink layer is HB-5H. A glossiness of the colored ink layer ranges from 0 to 60% (60°). A roughness of the colored ink layer is 50-1000 nm. A thickness of the colored ink layer is 1-10 microns, and a thickness of the high-frequency adhesive layer is 3-25 microns. The high-haze colored ultra-thin high-frequency cover film provided by the present invention includes a colored ink layer and a high-frequency adhesive layer, and the upper portion and the lower portion are respectively attached to the release film or the release layer of the release paper.