A coating prepared via laser cladding has the advantages of a high-density reinforced layer, a low matrix dilution rate, and combination with matrix metallurgy. In this study, Ni₃Al-based alloy cladding layers with Cr₇C₃ were prepared via laser cladding, and the corresponding microstructures and wear resistance were studied in detail. The results show that the Ni₃Al-based cladding layer prepared using laser cladding technology had good metallurgical bonding with the matrix, and there were no pores, cracks, or other defects on the surface. The microstructures of the laser cladding layer were mainly γ′-Ni₃Al, β′-NiAl, and in situ C₇C₃. As the laser power increased, the heat input increased, resulting in an increase in the dilution rate. Simultaneously, the carbide size in the laser cladding layer increased. With the increase in laser power, the hardness of the laser cladding layer of the Ni₃Al-based alloy decreased, and the wear resistance of the laser cladding layer first strengthened and then weakened. When the laser power increased to 2.0 kW, the wear rate of the laser cladding layer decreased to 0.480 × 10⁻⁵ mm³/N·m. When the laser power increased to 2.4 kW, the wear rate of the laser cladding layer increased to 0.961 × 10⁻⁵ mm³/N·m, which was twice the rate at 2.0 kW. This could be attributed to small Cr₇C₃ particles, which could not effectively separate the wear pairs, resulting in more serious adhesive wear. Large Cr₇C₃ particles caused the surface of cast iron material with lower hardness to be damaged, which suffered more serious particle wear. The generation of short rod-shaped carbides should be avoided because, in the process of friction and wear, carbides with these shapes are easy to break, thus leading to crack initiation.