As an emerging scintillation material, metal halide perovskite (${\text{CsPbX}}_3$) has been deemed the most potentially valuable candidate in X-ray detection and medical imaging. Nevertheless, it is a continuing challenge to implement efficient radioluminescence (RL) with high radiation stability and moisture resistance. Moreover, the optimized luminescence properties and excellent uniformity of ${\text{CsPbX}}_3$ glass are also key points for obtaining perfect X-ray images. Herein, we have successfully precipitated ${\mathrm{Eu}}^3$-doped ${\text{CsPbBr}}_3$ nanocrystals (NCs) with improved photoluminescence quantum yield ($\approx 58.6\%$) because partial ${\mathrm{Eu}}^3$ entered the perovskite lattice in a robust borosilicate glass matrix by in situ crystallization. The small amount of Eu addition made the lattice of NCs shrink and promoted uniform distribution of ${\text{CsPbBr}}_3$ NCs in the glass, which effectively reduced the light scattering of the sample. Subsequently, multimodal RL intensity of the ${\text{CsPbBr}}_3/{\text{CsPbBr}}_3$:xEu NCs glasses (CPB-0Eu/CPB-xEu) as a function of X-ray dose rate showed a superlinear relationship to the benefit of obtaining satisfactory X-ray images. Also, the outstanding radiation stability and water resistance of CPB-xEu were confirmed due to the protection of the robust glass matrix. Finally, an X-ray imaging system using a CPB-xEu scintillator was constructed, and the spring in the opaque sample was legibly detected under the motivation of X-rays, indicating that ${\text{CsPbX}}_3$ glasses possess extensive application prospects in terms of X-ray detection and medical imaging.