The fully-coated TiB₂-SiC coating was prepared by supersonic atmospheric plasma spraying (SAPS). The oxidation performance of TiB₂-SiC coating at 400 and 800 °C was studied and the oxidation mechanism was investigated. The corrosion resistance of TiB₂-SiC coating to aluminum melting salt at 900 °C was studied, and the anti-corrosion mechanism of molten salt was discussed. The results show that the TiB₂-SiC coating prepared by SAPS has good anti-oxidation performance. The oxidation rate constant at 400 °C is 1.92×10^-5 mg²·cm^-4·s^-1, and that at 800 °C is 1.82×10^-4 mg²·cm^-4·s^-1. The TiB₂-SiC coating prepared by SAPS has good resistance to molten salt corrosion at 900 °C. TiB₂-SiC coating maintains a dense structure after molten salt corrosion, and cracking and peeling of the coating do not occur.