Abstract: Diamond is the hardest material in nature, with excellent wear resistance. Metallizing the surface of diamond can enhance the bonding strength between the diamond and the brazing alloy. In this study, W-coated diamond particles and nickel-based brazing filler materials were used as coating materials, and an induction brazing process was employed to prepare a W-coated diamond/nickel-based brazing filler composite coating on the surface of H13 steel. The microstructure of the coating interface and its wear resistance were studied using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), abrasive wear testing, and super-depth microscopy. The results show that the content of W-coated diamond has a minimal impact on the interface bonding between the coating and the steel substrate, with no cracks or holes observed at the interface. The W layer on the surface of the W-coated diamond undergoes dissolution and diffusion, with a large amount of C-Cr and Ni-W compounds distributed on the surface of the W-coated diamond after brazing. The wear resistance of the coating increases and then decreases with the increase in W-coated diamond content. When the W-coated diamond content reaches 10 wt.%, the coating exhibits the best wear resistance, with a wear loss of 0.25 g, approximately 1/11 of the wear loss of H13 steel.