A repair method of rapid cladding and remelting on automobile transmission shaft material is proposed. The composite material of 316L stainless steel powder and nano SiC particles is used as the cladding powder. The porosity, microstructure, phase, hardness, residual stress and tensile strength of the repair layer are studied by experimental characterization. The results show that the porosity decreases from the bottom to the top of the repair layer, which is mainly composed of fine dendrite and cellular crystal, and the phase composition contains γ-CrFeNi、M7C3、FeSi、SiC. Besides, the average microhardness was 577 9.5 HV. Each layer of the cladding has been remelted synchronously, and most of the stress is released to form residual compressive stress. The average tensile strength, elasticity modulus and elongation are 835.5 MPa ± 22.0 MPa, 110.6 GPa± 17.0 GPa and 25.3% ± 0.6%, respectively.