The Lc-Sr-31 (Fe-based) alloy powder was deposited on the surface of the cast-steel material of a high-speed train-brake disk via laser cladding to obtain a composite coating with high temperature oxidation resistance. Optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometer were used to study the oxide film microstructure and phase composition of the Fe-based cladding layer, which was produced at different oxidation time at 650 ℃. Furthermore, the mechanism of high-temperature oxidation corrosion resistance was obtained. The results show that the Fe-based cladding layer and matrix material are metallurgically bonded and there are no defects such as cracks and pores. After 100-h oxidation treatment at 650 ℃, the dense Cr₂O₃ and SiO₂ oxide films are formed on the surface of the cladding layer and there is no clear oxidation mass gain. When the high temperature oxidation time is extended to 200 h, several discontinuous FeCr₂O₄ spinel oxides appear on the surface of the cladding layer, which provides continuous oxidation resistance for the matrix material.