In this study, the microstructure and mechanical properties of the laser cladding alloy coating on the surface of vermicular graphite cast iron are studied to overcome the technical bottleneck associated with the new dynamic vermicular graphite cast iron body materials that do not exhibit wear resistance. Laser cladding of nickel-based superalloy containing tungsten carbide (WC) reinforced phase on the surface of RuT300. Further, the microstructure and composition of the sample coating and the bonding zone are analyzed, the sample coating and substrate are subjected to the hardness test. The WC particles are unevenly distributed in the sample coating, and the uncompletely melted WC particles are considered to be non-uniform crystal nuclei. In addition, petal-like dendrites grow along the boundary of WC particles. The average hardness of the Ni-based WC composite coating is 4.52 times greater than that of the compacted graphite iron matrix. The distribution and solubility of the WC particles in this coating are non-uniform because the density of the WC particles is greater than that of the Ni-based powders and the heat dissipation in the molten pool is unbalanced. The presence of WC particles increases the hardness of the coating. In addition, the petal-like dendrites crystal provides a growth nucleus, which helps the particle phase in the coating to strongly combine with the Ni-based alloy solvent. Furthermore, the hardness and wear resistance of the coating are observed to improve.