The article discusses a method for producing nickel-based nano-microparticles with magnetic properties using the carbothermic reduction of precursors - nickel hydroxides. The possibility of a fairly simple and labor-intensive method for producing nickel (II) hydroxide by contact precipitation from a nickel-containing electrolyte on the surface of magnesium particles has been demonstrated. The method is based on the formation of local corrosive microgalvanic cells with predominant hydrogen depolarization. Both precursors and magnetic nickel powders were analyzed by SEM microscopy, X-ray dif-fraction and X-ray fluorescence analyses. Using the SEM microscopy method, it was found that, depending on the surface structure of the reducing agent particles, both lamellar structures of α/β-Ni(OH)2 and three-dimensional (3D) micro-nanostructures flower-like of β-Ni(OH)2 with varying degrees of crystallinity can be obtained. Thermal reduction annealing of α/β-Ni(OH)2 using the carbothermic method makes it possible to obtain a non-pyrophoric highly dispersed magnetic nickel-containing powder in a com-posite with microparticles of porous carbon, stabilized by the kotoite phase.