To enhance the wear resistance resistance of Ni-based coatings, Ni-based coatings were prepared using NiCrBSi (80 wt%) and WC/Co powders (20 wt%) as raw materials with a stable magnetic field assisted supersonic plasma spraying device at four magnetic field strength gradients. The microstructures, grain orientations and sizes of the four coatings were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) techniques. The mechanical and tribological properties of the four coatings were also investigated. The results show that the average grain size of the coating increases from 0.92 mu m decreases to 0.55 mu m. The composition distribution of hard phase is more uniform, and the defects such as internal pores are significantly reduced. The maximum wear loss of the coating was reduced by 66.1% after applying a stable magnetic field. The main wear mechanisms are adhesive wear and abrasive wear. This is because the steady magnetic field induces thermoelectric magnetic force (TEMF) and thermoelectric magnetic convection (TEMC) in the deposition process of the coating, resulting in uniform distribution of hard phase and fine grain. And the coating exhibits excellent wear resistance. This process provides new possibilities and methods for processing and molding of materials assisted by a steady magnetic field.