In order to improve the sealing effect between the lip seal and the grinding rotating shaft, and to enhance the wear resistance and anti-friction performance of the rotating shaft, and also to extend the service life of the lip seal, tungsten carbide coating is fabricated on the TC4 substrate by HVOF. Followed by the grinding and polishing processing to get the smooth surface, the W-doped diamond-like carbon film (W-DLC) is deposited by ion source assisted magnetron sputtering in this study. The microstructure, friction and wear, and sealing properties of the composite coating are evaluated by scanning electron microscope, tribometer and oil seal simulation test bench, respectively. According to the results, the HVOF-sprayed tungsten carbide layer has a uniform microstructure, the thickness of the W-DLC film with a transition from tungsten carbide content gradient is approximately 2.1-2.3 μm. Compared with the HVOF-sprayed WC coating, both of the friction coefficient and wear weight loss between the composite coating and F223-15 rubber or graphite abrasive parts are reduced to a certain extent, the leakage of lubricating oil is significantly reduced as well, and less abrasion is found for the lip seal. However, local spallation of the W-DLC film is found at the centre of the wear track on the shaft surface after the sealing test. Consequently, the composite coating has excellent wear resistance and antifriction performance, the sealing effect is also significantly strengthened. It has the potential as the protective coating for the grinding rotating shaft to be used in conjunction with the lip seal.