In order to study the influence of WC content on the corrosion resistance of Ni60 alloy coating and the related mechanism, WC with the different mass fraction was added to Ni60 self-fused alloy powder, Ni60/WC directional structure composite coatings with different WC contents were prepared on 45 steel by induction remelting and forced cooling technology. The corrosion resistance and mechanism of WC particles reinforced Ni60 alloy directional structure composite coatings were investigated by SEM, EDS, XRD, electrochemical test and immersion corrosion. Results showed that the polarization resistance of composite coatings increased first and then decreased with the increase of WC, and the maximum polarization resistance reached 9710.8 Ω when the WC addition amount was 10%. The corrosion current density of composite coatings decreased first and then increased, and the minimum current density reached 1.34×10_^-6 A/cm_² with 10% WC content. The WC content had the important effect on microstructures, element distribution, phases of composite coatings, and further affected the corrosion resistance.