Soil-engaging components of agricultural machinery face harsh conditions during tillage, involving severe abrasive wear and high-impact stresses, which render them susceptible to wear-induced failure. To enhance their service performance, this study employs vacuum plasma brazing technology to fabricate WC-Ni-based wear-resistant coatings with WC contents ranging from 30–70   wt.%. The results indicate that when the WC content is 50   wt.%, the coating achieves optimal overall performance, with synergistic enhancement of hardness, toughness, and corrosion resistance. The Vickers hardness reaches 1206 HV 20, compressive strength is 2.69   GPa, fracture toughness is 12.04   MPa·m 1/2, and corrosion resistance is exceptional. Under severe wear conditions, the wear rate of the coating is reduced by more than 90% compared to 65Mn steel, with a stable friction coefficient, demonstrating exceptional wear resistance. However, when the WC content exceeds optimal levels, internal defects within the coating increase, leading to a significant reduction in its performance under erosive wear conditions. In conclusion, the 50   wt.% WC nickel-based brazed coating, used as a surface protection material for soil-engaging components, can significantly extend their service life, thereby enhancing both the reliability and economic efficiency of agricultural machinery.