Marine engineering alloys must combine wear and corrosion resistance. High-entropy alloys (HEAs), with superior overall properties, are promising coatings whose tribo-corrosion performance can be enhanced by tuning the elemental distribution and phase separation. Co0.4 FeCrx Cu0.3 (x=0.8, 0.9, 1.0) high-entropy alloy coatings with varying Cr contents were fabricated via laser cladding technology to investigate the effects of the Cr content on the microstructure, wear resistance, and corrosion behavior of the alloys. The results show that as the Cr content increases, the distribution of  Cu transitions from a Cu-rich phase to a homogeneous solid solution, indicating that Cr enhances the solubility of Cu and reduces phase separation. XRD analysis reveals that all the alloys exhibit both FCC and BCC crystal structures. During the corrosion-wear process, corrosion significantly exacerbates the wear of the Cr0.4 FeCr0.9 Cu0.3 alloy. The calculation results of the corrosion-wear tests reveal that the total material loss of the Cr0.8 alloy under corrosion-wear conditions was significantly greater than the sum of pure corrosion and pure wear, indicating a greater synergistic effect between corrosion and wear. Compared with that of the Cr0.8 alloy, the corrosion-wear loss rates of the Cr0.9 and Cr1.0 alloys are lower. The Cr0.9 alloy was able to form a stable passivation film, effectively balancing the interaction between corrosion and wear.