In order to enhance the high-temperature antioxidant protection provided by glass coating on titanium alloy, this study introduces the Ti₃AlC₂ reinforcing phase into pure glass coating slurry by ball milling method, and scrapes the slurry onto the surface of TC4 alloy and conducts antioxidant test. The results show that when 5 wt.% Ti₃AlC₂ (TAC5 coating) was added, the α-contamination layer thickness of the TC4 alloy substrate is minimized, measuring approximately 65.78 μm. In comparison to the pure glass coating under similar test conditions, the α-contamination layer thickness of the TAC5 coating is reduced by about one quarter. This reduction occurs as the Ti₃AlC₂ reinforcing phase reacts with the infiltrated oxygen in the coating, thereby diminishing contact between the substrate and oxygen and improving the coating’s ability to safeguard the TC4 alloy against oxidation at elevated temperatures.