Supersonic laser deposition (SLD) is a new coating and fabrication process in which a supersonic powder stream produced by cold spray (CS) impinges on a substrate simultaneously heated by laser irradiation to expand the range of materials deposited under solid-state during SLD process. WC/Stellite 6 metal matrix composite (MMC) coating prepared by SLD and laser cladding (LC) are studied and compared in terms of macro- morphology, microstructure, interface dilution and unmelted WC proportion of coating, crack propagation resistance. The results show that the dense, crack-free coatings with uniform distribution of WC are achieved by SLD coating because of solid-state deposition, which can avoid the root causes of WC decomposition and dissolution in high temperature processing. The dilution rate of laser cladding coating is about 8.9%, while no macroscopic dilution zone is found in SLD coatings. The unmelted WC proportion of SLD coatings is about 27.6%, which is much higher than that of LC coatings. The results show that a great number of cracks around the indentation in LC coating while no cracks is found in SLD coatings under 50 kg load indentation indicate that the crack propagation resistance of supersonic laser SLD coating is superior to that of LC coating