To study the impact of temperature transfer between different channels in multi-channel cladding and explore the selection of process parameters for successful preparation of melted coatings, COMSOL Multiple-Field Numerical Simulation Coupling Software was used to melt multi-channel WC-12Co coating onto the surface of M2 high-speed steel substrate. The simulation temperature influence law was experimentally verified. The results indicate that the temperature transfer greatly affects each pass of the cladding layer during the preparation of the next two passes, with less influence on the next third pass. The heating rate of the first four channels differs from that of subsequent channels in the multi-channel melting process. Multichannel cladding with lower power is more advantageous in reducing heat accumulation and successfully preparing cladding coatings. When the laser power is 900 W, the laser energy during the preparation of the cladding coating matches well with the degree of thermal influence between adjacent subsequent channels, resulting in a cladding coating with better macroscopy, fine structure, and no defects.