Abstract: The Ni60/La₂O₃ alloy cladding layer is prepared on the surface of 35CrMoV steel by alternating magnetic field assisted laser cladding technology. The effects of alternating magnetic field frequencies of 50 Hz, 100 Hz, 150 Hz and 200 Hz on the microstructure, phase composition, element segregation, friction and wear and corrosion resistance of the cladding layer are studied. Results show that the change of alternating magnetic field frequency significantly changes the microstructure and properties of the cladding layer by affecting the element diffusion, crystallization process and phase transformation behavior in the molten pool. The Ni60/La₂O₃ cladding layers with different alternating magnetic field frequencies are composed of γ- (Fe, Ni), Cr₂B, Cr₂₃C₆, CrB, Cr₇C₃ and Ni₃Si phases, and the phase compositions are different with different frequencies. The segregations of Ni, Cr, C and Fe in the cladding layers with 50 and 200 Hz are greater than those at 100 and 150 Hz. The increase of magnetic field frequency can improve the microhardness of the cladding layer, and the hardness value is the largest and the fluctuation range is large when the alternating magnetic field frequency is 200 Hz. The wear scar depth decreases first and then increases with the increase of frequency, and the wear scar depth and friction coefficient are the smallest when the frequency is 150 Hz. The corrosion resistance of the cladding layer is the best when the frequency is 150 Hz, with the self-corrosion potential of -0.250 V and self-corrosion current density of 1.33×10^-9 A/cm².