This study investigates the fabrication of CoCrFeNiAlNb 0.3 high-entropy alloy (HEA) coatings using a laser/ultra-high frequency (UHF) induction hybrid deposition method, with a focus on addressing crack suppression and performance enhancement. The synergistic effects of UHF induction heat on microstructural evolution and mechanical properties were systematically evaluated under varying current densities through multiscale characterization, including microstructural analysis, elemental mapping, microhardness testing, tribological assessments, and electrochemical measurements. The results showed that the introduction of UHF induction heat effectively suppressed the initiation of cracks and significantly improved the forming quality of the coating. Despite moderate grain coarsening, the laser-UHF induction hybrid deposited coatings exhibited uniform microstructure with refined morphological regularity, while inhibiting the formation of Laves precipitated phases and increasing the content of BCC phases. Notably, the laser-UHF induction hybrid deposited CoCrFeNiAlNb 0.3 HEA coatings achieved a peak microhardness of 704.7 HV, representing a 56.95 % improvement over conventional laser deposited counterparts. At the optimized current density of 1.14 × 10 8 A·m −2, the coating displayed superior wear resistance, evidenced by a reduced friction coefficient (0.391 vs. 0.473) and wear rate (2.28 × 10 −3 vs. 11.34 × 10 −3 mm 3·N −1·m −1), alongside enhanced corrosion resistance attributed to the formation of a continuous passivation layer. This work highlights the critical role of parametrically controlled UHF induction heat in synergistically optimizing mechanical robustness and environmental durability for laser deposited HEA coatings, establishing a promising pathway toward engineered high-performance protective coatings for demanding industrial applications.