The work aims to improve the wear and corrosion resistance of TC4 titanium alloy. The titanium carbide nitride coating was prepared on the surface of TC4 alloy by double cathode plasma sputtering deposition. The phase composition of the coating was characterized by XRD, and the microstructure of the coating was characterized by SEM. The adhesion of the coating to the substrate was studied by an acoustic emission scratch tester. The friction and wear tester was used to study the friction and wear properties of the TiCN coating. Electrochemical experiments were carried out in 3.5wt.% NaCl solution with electrochemical workstation. The deposited coating was uniform and dense without obvious defects. The coating consisted of a TiCN deposit with an outer layer thickness of about 8 μm and a transition layer of about 4 μm thick below it. The TiCN coating had a higher bonding strength with the TC4 substrate and its binding force reached 66.4 N. The wear scar width of the TiCN coating was much smaller than that of the TC4 alloy substrate under the same normal load at room temperature. The specific wear rate of TiCN coating was about (1~2)×10-5 mm3/(N?m), and the specific wear rate of TC4 titanium alloy was about (2~4)×10-4 mm3/(N?m). The TiCN coating had a specific wear rate, an order of magnitude lower than that of the TC4 titanium alloy and insensitive to changes in load. The TiCN coating had a higher self-corrosion potential and a lower corrosion current density than the TC4 titanium alloy substrate. The corrosion current density of the coating and the TC4 titanium alloy was respectively 1.57×10-9 A/cm2 and 1.35×10-8 A/cm2. The corrosion current density of the coating was an order of magnitude lower than that of the titanium alloy substrate. The EIS impedance spectral capacitance of the TiCN coating was also large. TiCN coating deposited by double cathode plasma sputtering can effectively improve the wear and corrosion resistance of TC4 titanium alloy.