The invention discloses a titanium coating and a preparation method thereof. The titanium coating is prepared by using a substrate as a cathode, a titanium plate as an anode and an eutectic salt containing K2TiF6 as a molten salt and heating the above-mentioned materials to a temperature of 710 to 750 DEG C under protection of inert gas for a reaction at a constant current of 250 to 600 mA/cm<2> for 0.5 to 2 h, wherein the weight of K2TiF6 accounts for 14 to 16% of the eutectic salt, and the eutectic salt comprises, by mol, 49 to 51% of NaCl and 49 to 51% of KCl or 40 to 41% of NaCl, 50 to 51% of KCl and 9 to 10% of NaF. According to the invention, NaCl-KCl-K2TiF6 or NaCl-KCl-NaF-K2TiF6 which is cheap, easily available and easy to store and transport is used as the molten salt and has small reaction corrosivity; the reaction is rapid, and high deposition efficiency is obtained; used equipment is simple, costs little and is easy to operate; and the obtained titanium coating has good compactness and high purity and tightly bonds with a matrix.