This study aimed to investigated the effects of steady magnetic fields with different intensities on laser cladding of Inconel 718 superalloy. Laser cladding experiments were conducted under four different magnetic field strengths （0，100，300，500 mT）， and numerical simulation combined with typical experiments was used to study the surface morphology， keyhole mode temperature field changes， microstructure， and mechanical properties of the cladding layer. The results show that when B=300 mT， the melting and evaporation latent heat barrier of the material is significantly suppressed， the morphology between the keyhole solid-liquid interface is most uniform， and the surface morphology of the cladding layer is optimal， with an average surface roughness Ra of about 4.1 μm. The microstructure is mainly composed of equiaxed grains with an average grain size of about 5.1 μm. Although the change in hardness is not significant， the average tensile strength of the cladding layer can be increased to 1.122 GPa， with an average elongation of 29.9%. The study demonstrates that a steady magnetic field of appropriate strength can significantly improve the comprehensive performance of the Inconel 718 laser cladding layer， providing theoretical basis and experimental data support for the application of magnetic-controlled laser cladding technology in related industrial fields.