Glass scintillators with high X-ray excited luminescence (XEL) intensity, superior thermal stability and excellent spatial resolution are expected to be applied in high-temperature X-ray imaging applications. In this study, Mn2+-doped fluoroaluminosilicate glass scintillators with excellent scintillating performances and anti-thermal quenching behavior were successfully prepared. The optimal sample has excellent XEL intensity (83.9% of that of commercial Bi4Ge3O12 (BGO) scintillators), good irradiation resistance and reusability. Notably, due to thermal compensation effect, optimal sample exhibits anti-thermal quenching behavior (XEL intensity at 393 K is 104% of that at 303 K) and excellent thermal stability (XEL intensity at 573 K maintains 61% of that at 303 K), which has superior thermal stability than that of BGO (XEL intensity at 393 K is 19% of that at 303 K). In addition, optimal sample is applied to X-ray imaging, and its spatial resolution reaches 20 lp/mm. High-temperature X-ray imaging reveals that imaging clarity enhances with increasing temperature. In summary, Mn2+-doped fluoroaluminosilicate glass scintillators exhibit superior high-temperature stability and imaging performance, and provide a new type of scintillating material with potential applications in the field of radiation detection.