To investigate the impact of oxidation behavior on tribological properties of NiCrFe/Al/BN abradable seal coatings (ASCs), NiCrFe/Al/BN ASCs were prepared by thermal spraying. The oxidation behaviors at 650 °C for 192 h and the tribological properties of oxidized coating were discussed. The effect of oxidation on the tribological properties of the coating was that oxidation promoted the formation of hard oxides on the surface of the coating, aggravated the damage to the wear ball, and thus reduced the tribological properties of the coating. Specifically, the formation of θ-Al 2O 3 and Cr 2O 3 oxidation products the friction increased coefficient and grinding ball weight loss of oxidized coatings. In the initial 72 h, needle-like θ-Al 2O 3 and small block-like Cr 2O 3 formed on the surface of coatings. Over the subsequent 120 h, only Cr 2O 3 continued to grow, attributed to the depletion of aluminums on the surface. Eventually, the large block-like hard spinel Cr 2O 3 and needle-like θ-Al 2O 3 covered coatings, resulting in an increase in the friction coefficient of the oxidized coatings, as well as intensified weight loss on the grinding ball. Additionally, the inner oxidation was concentrated in the pores. The oxidation growth of alumina inside the coating will fill the pores inside the coating, thereby increasing the hardness of the coating. In summary, long-term oxidation would cause the NiCrFe/Al/BN ASCs to harden and intensify wear on the grinding ball, indicating that high-temperature oxidation weakened the abradability of the NiCrFe/Al/BN ASCs. Future research on novel NiCr-based ASCs should prioritize enhancing oxidation resistance as a key focus.