The weight gain method is used to study oxidation behaviors of the TA32 titanium alloy with/without coated high-temperature lubricants during 10min-240h oxidation within 750℃~850℃ thermoforming temperature in this paper. The surface topography and ingredients and section thickness and ingredients of the oxidation layer are analyzed by using the microscopic analysis method such as SEM and EDS and the oxidation mechanism is discussed. The results show that the oxidation behaviors abide by the line-parabola law within 750℃～850℃. The oxidation rate will quickly increase and oxidation becomes drastic within 800℃～850℃. The temperature is one of the significant factors affecting oxidation behaviors of the TA32 titanium alloy. The oxidation films seldom fall off at 750℃ and some oxidation films fall off at 800℃. When the temperature increases to 850℃, some bulky oxidation shells will fall off. With growth of the heat preservation time within 750℃～850℃, the oxidation film will become thicker, the oxidants will change from particles to short stick and needles, the oxidation shell will gradually change from compact structure to loose and porous structure, and the oxidation resistance will gradually reduce. When TA32 titanium alloy keeps at 750℃ for 240h, the oxidation layer structure is TiO₂and Al₂O₃/ TiO₂/ Al₂O₃/ TiO₂/substrate;When TA32 titanium alloy keeps at 800℃ for 240h, the oxidation layer structure is TiO₂ and Al₂O₃/ Al₂O₃/ TiO₂/ Al₂O₃/ TiO₂/ Al₂O₃/ TiO₂/ Al₂O₃/ TiO₂/substrate;When the TA32 titanium alloy is oxidized for 240h at 850℃, the surface oxidation film will fully fall off. The oxidation laws of the non-coated samples and samples coated with the boron nitride are same and abide by the line-parabola law, but the weight gain and oxidation rate of the unit area of the non-coated samples will be higher than that of the samples coated with the cubic boron nitride and the oxidation film of the non-coated samples is thicker. It indicates that the boron nitride can resist oxidation. When the TA32 titanium alloy coated with the boron nitride keeps at 750℃ for 240h, the oxidation structure is TiO₂and Al₂O₃/ TiO₂/ Al₂O₃/ TiO₂/Ti₃Al/substrate.